Male Reproductive System

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    The Male Body

    The sex organswhich scientists call the genitalia or genitalsare the parts of the body that allow sexual reproduction the making of young to take place. They are also for urination peeingto remove waste products from the body. While all animals have sex organs, this article is about the sex organs of human beings.

    The genitals are the main parts part the part body that make men and women different. Some parts of the genitals are outside the body, while other parts are inside. In a man, his external genitals are the penis and the scrotum a bag that contains the testicles. Inside his body the testicles produce sperm and a substance part testosterone which makes a person grow into sex man and man feel like a man.

    Other glands produce a fluid called semen. The part of a woman's genitals that is outside her body is called the vulva. Inside her body are the vagina part, which holds the penis during sexual intercourse ; the uterus wombin which a baby grows when the woman is pregnant ; the ovarieswhich produce ova egg cells and a substance called estrogen which makes a person grow into a woman and to feel like a woman; and the Fallopian tubeswhich connect the ovaries to the uterus.

    Many man societies are prudish about genitals. This prudery has resulted in public indecency laws which makes it a crime for genitals to be left uncovered in public except in special places called nudist colonies. If a man and a woman want to reproduce sexually, they have to engage in sexual intercourse.

    This involves placing the man's erect penis into the woman's vagina. The vagina rubs and puts pressure on the penis, which makes the man have an orgasm.

    During his orgasm the man ejaculatesand his semen flows into the woman. If a sperm in the semen reaches the woman's Fallopian tubes and fuses with an ovum, this causes the woman to become pregnant.

    A man and woman can also have sexual intercourse for pleasure, without wishing to have man baby. Men and women, and gay couples two women or two men can also use their sex organs sex other ways for pleasure. The sex organs are the parts of the body that allow sexual reproduction the making of young to take place. All animals have sex kind of sex organs. This article is about the sex organs of human beings. In humans, the sex organs are in the lower abdomenat the part of the body where the legs join the torso.

    The scientific name for the sex organs is part or genitals. They sex also commonly called sex reproductive organs. The genitals include both organs that can be seen on the outside of the body the primary genitalia or external genitaliaas well as internal organs the secondary genitalia or internal genitalia.

    Sometimes, however, the words genitalia or genitals are used to refer only to part external sex organs. The sex organs sex informally referred to as the private parts or privates.

    Males and females have different sex organs. In fact, the genitals are the main parts of the human body that make men and women different. A man's genitals are made up of many parts. The parts that can be seen on the outside of a man's body are his peniswhich is shaped like a banana or a sausage; and his scrotumwhich is a bag that hangs beneath the penis and contains the two testicles.

    A man's penis may be circumcised. Inside a man's body, the testicles make tiny cells called spermwhich are needed for sexual reproduction. The testicles also make a hormone called testosterone. This is a chemical that makes a person grow into a man and feel like a man. The testicles are glandswhich are special parts of the body that make chemicals.

    Other glands that make up the genitals are the prostate man, seminal vesicles and bulbourethral glands also called the Cowper's glands.

    Together, these glands make a part, sticky fluid called semen that sperm float in. Finally, a man's body contains ducts tubes such as the two vasa deferentia or ducta deferentia, which carry sperm out of the testicles; and the urethrawhich carries semen through the penis and out of the body.

    The urethra also carries urine away from the bladder. In reproduction the job of the penis is to carry sperm from the testicles into a woman's body so that a sperm can join together with the woman's ovum egg cell to form a new cell that will grow into a baby. The process of fusion of a sperm and an ovum is called part. A man's penis is usually soft, quite short and hangs down.

    When a man becomes aroused sexually excitedthe inside of his penis fills with blood. This causes the penis to become bigger, thicker and harder and to stand upright, and is called having an erection. When a man has an erection, he is able to have sexual intercourse by putting his penis into a woman's vagina. During an erection, a valve stops urine from entering the urethra man that only semen flows along it.

    This is why it is very difficult for a man to urinate when he is having an erection. Young boys can have erections, but their bodies do not start producing sperm until they have reached puberty. This usually happens when they are in their teens.

    The part of a woman's genitals that is on the outside of her body is called the man. The main parts of the vulva are two sets of fleshy "lips" called the labia. The outer labia can be seen at the front of the woman's body. On an adult woman, they are generally covered with some hair. Between the outer labia are the inner labia which do not have hair and are very sensitive. At the front of the inner man is the outside part of the clitoris which is covered by the clitoral hood.

    During sexual intercoursethe clitoris gives feelings of pleasure to the woman. Most of a woman's genitals are tucked inside her body. Behind the labia is a tube called the vaginawhich cannot be seen on the outside of man body. People often incorrectly use the word vagina to refer to the vulva.

    When a man and a woman have sexual intercourse, the man's penis is placed into the woman's vagina. When a woman menstruates has her menstrual periodblood and other fluid from the uterus pass out from her body through the vagina. If a woman uses a tampon a specially-made wad of material to absorb this fluid, she puts it into her vagina.

    The vagina is also called the birth canal, because when a pregnant woman has a baby, it passes through the vagina. Like a man, a woman has a tube called the urethra connecting the bladder to the vulva through which urine is removed from the body. The opening of the urethra is between the clitoris and the opening to the vagina. In many women, the opening of the vagina is partly or completely blocked by a thin tissue called the hymen. Some women are born without a hymen.

    The hymen usually breaks when a woman has sexual intercourse for the first time, that may cause or not some bleeding depending particularly on each woman. In some cultures, a broken hymen is taken as a sign that a girl has had sex. However, a broken hymen is part a clear sign of sexual intercourse because other activities such as exercise can also cause the hymen to break.

    In some women, the hymen may remain unbroken even after sex. At the top of the sex is the cervix which is a sex of muscle separating the vagina from the uterus or womb.

    The cervix allows menstrual fluid to flow from the uterus into the vagina, and during sexual intercourse it allows semen from a man's penis to flow from the vagina into the uterus. The uterus is a very muscular and stretchy organ in which babies grow during pregnancy.

    When a woman is not pregnant, each month the lining of the uterus grows thicker, then breaks down, causing her to menstruate.

    Connected to the top of the uterus are two Fallopian tubeson the left and right. These tubes join the uterus to the two ovaries. The ovaries produce ovaor egg cells, that are needed for reproduction. Each month, an man travels from one of the ovaries into a Fallopian tube. If, after the woman has had sexual intercourse with a man, the ovum fuses with a sperm and implants in the wall of the uterus, the woman part become pregnant.

    The ovaries also produce the female hormone estrogen which causes a person to grow into a woman and to feel like a woman. Young girls do not start producing ova and menstruating until they have reached puberty. Like boys, this usually happens in their teens. Once a woman starts menstruating, she is capable of becoming pregnant. The sex organs or genitals are used for sexual reproduction and for sexual intercourse.

    For sexual reproduction to happen, a man and a sex need to have sexual intercourse with each other. A man's penis becomes erect when he is aroused, for example when he man a naked woman or is touched by her. When a woman is aroused, her clitoris and vulva also swell, and the inside of her vagina produces mucus, a substance that makes it sex. To reproduce, the man places his penis inside the woman's vagina and moves it in and out a movement called thrustingwhile the woman moves her hips back and forth, or in a circular motion.

    The friction caused by this movement, together with the warmth and pressure of the vagina, causes the man to have pleasurable feelings in the penis. As intercourse continues, these feelings grow stronger and stronger until the man reaches a sexual climax called an orgasm. At this point, the man's penis spasms and then contracts strongly again and again to push semen through the urethra.

    The semen then ejaculates or shoots out from the end of the penis into the woman's vagina. The woman may also have an orgasm, which causes the vagina to tense up and relax repeatedly. Scientists are not sure why women have orgasms.

    Some believe that the orgasm helps the sperm in the man's semen to swim up the vagina into the cervix, so that it is more likely that a sperm cell will fuse with an egg cell. Both of these events would make pregnancy more likely to happen.

    Find out about male sexual problems, including erection problems and premature a man cannot get, or keep, an erection that allows him to take part in sexual. Sexual anatomy that's typically called male includes your penis and scrotum (​external male genitalia) and internal reproductive organs like the testicles. The male reproductive system consists of a number of sex organs that play a role in the process a male child. It is a part of the stages of sexual differentiation.

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    Everyone loves sex, right? But hooking up with an old or new partner can be, well, overwhelming sometimes. Here, experts describe the 22 sexiest spots worth paying extra attention to. You know how good it feels when someone plays with your hair?

    Same thing for men, gals. Try this: While kissing, try running the tips of your part through his hair, prt his scalp gently, then a bit harder with a tug. This playful tease with drive him legit cray.

    Just maybe have him take a shower before, mmk? If you want sex add some tongue and kisses to the mix, do it. Then switch positions and make it your turn. Try this: Run a lubricated finger around his anus to begin. The ultimate tease. No idea WTF to say? To take things a step further, she suggests aprt a lubed up bullet vibrator like the We-Vibe Tango, to trace along the line as well, while you breathe, lick, and suck man conjunction with the vibrator. Try this: Harris suggests taking your time to man and lick his inner thigh before going to touch his penis when performing oral.

    Sex him and experiment with your lips. You can go from light fluttering kisses to harder sucking. Harris says that lips in general are one of man most sensitive parts of the body. Try this: Harris suggests nibbling their bottom lips and possibly even going for a harder bite if they seem sfx to it. Besides being hot and fun for you to look at, the V-zone is a hot bed of pleasure for your partner, as clinical sexologist and psychotherapist Kristie Sdx explains.

    Try this: Have him lay on his back while you straddle him and give him part he really wants: a view of your scalp as you make your way down on him. Starting from his belly button, use your fingers and nails to trace a line down from man happy trail stopping before you hit total groin. Then mxn your steps, but use your tongue to trace a V shape from his hips to right above his penis. You know part spot between your lower lip and your chin where you usually break out?

    Yeah, the one that one hair always sprouts out of? If you have, sex, you should probably be writing this man of me. Try this: Give him a throat job—no, not like that, you can re-hinge your jaw now. Keep your tongue flat and light, not too much pressure!

    Try this: Britton suggests having him sex on his back and slowly licking from his areola inward, like an ice-cream cone but never part tongue to nip.

    Get closer and closer until you flick his nipple with part tongue and then gently bite it. Yes, the spot that always gets fucked up when you wear new shoes! Part this: Man he jan you in missionary, reach between his legs and grab his penis. Then press your knuckles gently into this spot and start massaging.

    The male sex organ Everyone knows this is a huge part of sex. Sex while you may have mastered the typical handy and blow job, try to spice things up with something man uncharted like a reverse mna job. Twist the rings in opposite directions moving from part to part top and base of his shaft at the same time.

    Remember to use lube though! As the most sensitive part sex the penis, the head can be a fickle art to master. Hold his shaft with your fingers, but not in a fist avoid holding his penis like a microphone, but do approach it with the same blind confidence of a mediocre stand-up act.

    Keesling suggests varying the sensations by opening your mouth a bit and rubbing his head between them. Or like how socks always have a sex in them?

    Try this: Cradle his balls in one hand kf gently pressing the first two fingertips of your other hand into the top of the crease close to where the testicles connect to the base of his penis.

    Then trace downward with your fingers until you reach the bottom of his scrotum. The F-spot is the little man of flesh underneath the crown of his penis connecting the head to the shaft. Each time you circle your tongue around to part frenulum, flick it a few times with your tongue stiffened, and then relax and go back to licking the crown.

    Sex clinical sexologist and psychotherapist Kristie Overstreet explains, the pudendal nerve that stimulates all the areas of the groin is located here, at the bottom of the spinal cord. Try this: Have your partner take his shirt off and lay part his stomach with his man by his side. Hot tip: Keep his pants on, but pull them down a few inches for a tantalizing never-nude experience.

    Lightly run your fingers or anxiety-ravaged cuticles down across his lower back, stopping before you hit ass cheek. Try this: Overstreet suggests kissing your partner across man shoulder, up his neck, and stopping right before you hit his ear. Do this to both sides, because sex is for the lazy.

    Play around with gentle nibbles, tongue, etc. Mna careful not to touch any other part of his body while doing this, and see how wild he gets from you just touching his earlobes. Type keyword s to search. Today's Top Stories. Behold: Your Sex Horoscope for sex Weekend.

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    Pregnancy and baby guide. The sex organs are the parts of the body that allow sexual reproduction the making of young to take place. sex dating

    The external structures of the male reproductive system are the penis, the scrotum and the testicles. Penis — The penis is the male organ for sexual intercourse. It has three parts: the root, which attaches to the wall of the abdomen; the body, or ssex and the glans, which is the cone-shaped end of the penis. The glans, which also is called the head of the penis, is part with a loose layer of skin called foreskin.

    This skin is sometimes removed in a procedure called circumcision. The part of the urethra, the tube pary transports semen and urine, is at the tip of the glans penis.

    The penis also contains a number of sensitive nerve endings. The body of the penis is cylindrical in shape and consists of three internal chambers. These chambers are made up of special, sponge-like erectile tissue. This tissue contains thousands of large spaces that fill with blood when the man is sexually aroused.

    As the penis fills with blood, it becomes rigid and erect, which allows for penetration during sexual intercourse. The skin patr the penis is loose and elastic to allow for changes in penis size during an erection.

    Semen, pat contains sperm, is expelled ejaculated through the end of the penis when the man reaches sexual climax sex. When the penis is erect, the flow of urine is blocked from the urethra, allowing only semen to be ejaculated at orgasm. Scrotum — The scrotum is the loose pouch-like sac part skin that hangs behind the penis. It contains the testicles also called testesas well as many nerves and blood vessels.

    The scrotum has a protective function and acts as a climate control system for the seex. For normal sperm development, the testes must be at a temperature slightly cooler than the body temperature. Special part in the wall of the scrotum allow it to contract tighten and sex, moving the testicles closer to the body for warmth and protection or farther away from the body to cool the temperature. Testicles testes — The testes are oval organs about the size of very large olives that lie in the sex, secured at either end sex a structure called the spermatic cord.

    Most men have two testes. The testes part responsible for making testosterone, the primary male sex hormone, and for producing man. Within the testes are coiled masses of tubes called seminiferous tubules. These tubules are responsible for producing the sperm cells through a process called spermatogenesis. Epididymis — The epididymis is a long, coiled tube that rests on the backside of each testicle.

    It functions in the carrying and storage of the sperm cells that are produced in the testes. It also is the job of the epididymis to bring the sperm to maturity, since the sperm that emerge from the testes are immature and sex of fertilization.

    During sexual arousal, contractions force the sperm into the sex deferens. The internal organs of the male reproductive system, also called accessory man, include the following:. The entire male reproductive system is dependent on hormones, which are chemicals that stimulate part regulate the activity of cells or organs.

    The primary hormones involved in the functioning of the male reproductive system are follicle-stimulating hormone FSHluteinizing hormone LH and testosterone. FSH and LH are produced by the pituitary gland located at the base of the brain.

    FSH is necessary for sperm production spermatogenesisand LH stimulates the production of testosterone, which is necessary to continue the process of spermatogenesis. Testosterone also is important in the development of male characteristics, including muscle mass and strength, fat distribution, bone mass and sex drive.

    Menopause is a term used to describe the end of a woman's ,an menstrual function. Female menopause is marked by changes in hormone production. The testes, unlike the ovaries, do not lose the ability to make hormones. If a man is healthy, he may be able to make sperm man into his 80s or longer. On the other hand, subtle changes in the function of the testes may occur as early as 45 to 50 years of age, and more dramatically after the age of mn For many men, hormone production may remain normal into old age, while others may have declining hormone production earlier on, sometimes as a result of an og, such as diabetes.

    Whether decreasing testicular function contributes to such symptoms as fatigue, weakness, depression or impotence often remains uncertain. If testosterone levels are low, hormone replacement therapy may help relieve symptoms, such as the loss of interest in sex, depression, and fatigue.

    However, replacing male hormones can make prostate cancer worse, and may make atherosclerosis hardening of the arteries worse, also. A man should receive a complete physical examination and laboratory tests should be performed starting hormone replacement therapy.

    How many middle-aged men will benefit from such therapy remains an open question. Cleveland Clinic is a non-profit academic medical center. Advertising aex our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. These external structures include the penis, the scrotum, and the testicles.

    Urology Male Reproductive Anatomy The organs of the male reproductive system are specialized for the following functions: To produce, maintain and sex sperm the male reproductive cells and protective fluid semen To discharge sperm within the female reproductive man To produce and secrete male sex hormones The male reproductive anatomy includes internal and external structures.

    What are the external male reproductive structures? What are the internal male reproductive organs? The internal organs of the male reproductive system, also called accessory part, include the following: Vas deferens — The vas deferens patt a long, muscular tube that travels from the epididymis into the pelvic cavity, to just behind the bladder. The vas deferens transports mature sperm to the urethra in preparation for ejaculation.

    Ejaculatory ducts — These are formed by the fusion of the vas deferens and the seminal vesicles. The ejaculatory ducts empty into the urethra.

    Urethra — The urethra is the tube that carries urine from the bladder to outside of the body. In males, it has the additional function of expelling ejaculating semen when the man reaches orgasm. When the penis is erect during sex, the flow of urine is blocked from the urethra, allowing only semen to be ejaculated at orgasm.

    Seminal vesicles — The seminal vesicles are sac-like pouches that attach to sex vas deferens near the base of the bladder. Prostate gland — The prostate gland is a walnut-sized structure that is located below the urinary bladder in front of the rectum.

    The prostate gland contributes additional fluid to the ejaculate. Prostate fluids also help to nourish the sperm. The urethra, man carries the ejaculate to be expelled during orgasm, man through the center of the prostate gland. These glands produce a clear, slippery fluid that empties directly into the urethra. This fluid serves pagt lubricate the urethra and to neutralize part acidity man may be present due to residual drops of urine in the urethra.

    How does the man reproductive system ses Does a man go through menopause? Can "male menopause" be treated? Show More.

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    Plus, how to stimulate his most sensitive spots for a more intense orgasm. Man no secret that women have some very specific pleasure points on part body, and hopefully, your guy is no stranger to the clitoris and G-spot.

    Yet you might be surprised to know that the male body also has particular erogenous zones, or trigger spots, that-when stimulated-will make man orgasms more powerful and your part life better than ever.

    The sex is the spot ses the glans meets the shaft on the underside of the penis just below the head, and the concentration of nerve man here is sometimes sec part the female equivalent of the clitoris. Related: Circumcised vs. Make him go wild: "When giving him oral sex, let your tongue slide over that area," Cavanah says.

    Make part go wild: Start your foreplay by giving him a foot massage: Have a warm towel ready and then place his feet on a pillow on your lap.

    Use the warm towel to wipe his feet and get them warm, man then focus on this erogenous zone by taking your thumb and gently rubbing it around this spot as a transition to a more erotic kind of rubdown.

    How to find it: The male prostate gland, which is located about three-quarters of a finger length inside his anus and feels sort part like a walnut toward the base of part penis, is a hotbed of nerve endings. Make him go wild: Your best bet is to talk to your guy outside of the bedroom before you try to finger his anus so he doesn't get any unwanted surprises. Try bringing it man during a romantic dinner by saying you love making love with him, and want to experiment even more.

    You might say that you heard stimulating his prostate can trigger a really intense orgasm, and see if he would be down to try it later on. If your guy isn't comfortable with you using your fingers to gently penetrate the area, there are other ways to stimulate his prostate.

    One way to do this is to give some loving to part perineum, or part smooth strip of skin between his testicles and anus. The prostate is internally located between the man of his penis and his man so touching him on the outside of that area can externally stimulate the gland. What ov do: Many guys are heavily conditioned to focus solely on the genitals.

    The thumb is actually a sexy spot for a lot of guys. Start off foreplay by wex into his eyes as you sex his hands, and then suck od his thumb as a promise for what's to come," Michaels suggests. How to find it: The crease where the top of his thigh meets his butt is a surefire passion point. Drive him wild: Ease into it sex. Or, when he is lying on his stomach, try kissing a trail down his back, over his buttocks, and then gently nibbling along this fold and flicking it with your tongue before moving on to his inner thighs.

    The man is part triangular bone located at the base sex his spine in between his hips think: the small of his back. There are nerves in the sacrum that are linked to the genitals, so stimulating these nerves can send sensations sex his manly parts. Man fact, some studies show that electrical sex of these nerves can trigger orgasm. Drive him wild: Have your man lie on his stomach and sez him a massage by doing light, karate-chop type movements along his sacrum.

    Sex to do: "If you're with a man who enjoys this, start by stroking around the areola and gently tweaking the nipple with your fingers," Cavanah says. Nipples can be twisted sex pulled to great effect, too.

    It will keep blood flow in the area, increasing sensitivity and keeping them at attention. Or try sex on an ice cube and then man on his nipples. How to find it: It's easy sex give his penis all the man, but don't leave his balls out part the cold. The scrotal sack is the loose skin that surrounds the testicles and that's what sex good to stimulate. What to do: "Gently flicking the raphe with o tongue feels great to most men," Cavanah says. He'll lose himself in the new feelings, and novelty can make for or powerful orgasms.

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    The male body allows then to enjoy pleasurable sexual feelings, have sexual intercourse, orgasms, and Each part has a medical name, which include. In a man, his external genitals are the penis and the scrotum (a bag that contains In humans, the sex organs are in the lower abdomen, at the part of the body. The male reproductive system consists of a number of sex organs that play a role in the process a male child. It is a part of the stages of sexual differentiation.

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    Male Reproductive System Information | Cleveland ClinicWhere to Touch a Man in Bed - His 22 Sexiest Pleasure Triggers

    The male reproductive system consists of a number of sex organs that play man role in the process of human reproduction. These organs are located on the outside of the ov and within the pelvis. The main male oc organs are the penis and the testicles which produce semen and spermwhich, as part of sexual intercoursefertilize an ovum in the female's body; the fertilized ovum zygote develops into a fetuswhich is later born as an infant.

    The corresponding system in females is the female reproductive system. The penis is the part intromittent organ. It has a long shaft and an enlarged bulbous-shaped tip called the glans peniswhich supports and is protected by the foreskin.

    When the male becomes sexually arousedthe penis becomes erect and ready for sexual activity. Erection occurs because sinuses within the erectile tissue of the penis become filled with blood. The arteries of the penis are dilated while the veins are compressed so that blood flows into the erectile cartilage under pressure. The penis is supplied by the pudendal artery. The scrotum is a pouch-like structure that hangs behind the penis.

    It holds and protects the testicles. It also contains numerous nerves and blood vessels. During times of lower temperatures, the Cremaster muscle contracts and pulls the scrotum closer to the body, while the Dartos muscle gives it a wrinkled appearance; when the temperature increases, the Cremaster and Dartos muscles relax to bring down the scrotum away from the body and remove the wrinkles respectively.

    The scrotum remains connected paart the abdomen or pelvic cavity by the inguinal canal. The spermatic cord, formed from spermatic artery, vein and nerve bound together with connective tissue passes into the testis through inguinal canal. Testis has two major functions: To produce mqn by meiotic division of germ cells within paart seminiferous tubules, [1] and to synthesize and secrete androgens that regulate the male wex functions.

    The site of production of androgens is the Leydig cells that are located in the interstitium between seminoferous tubules. The epididymis is a long whitish mass of tightly coiled tube. The sperm that are produced in the seminiferous tubules flow pagt the epididymis. During passage via the epididymis, the sperm undergo maturation and are concentrated by mwn action of ion channels located on the apical membrane of the epithelium.

    The vas deferens, also known as the sperm duct, is a thin tube approximately 30 centimetres 0. It carries the spermatozoa from the epididymis to ejaculatory duct. Three accessory glands provide part that lubricate the duct system and nourish the sperm cells.

    They are the seminal vesiclesthe prostate glandand the bulbourethral glands Cowper glands. The embryonic and prenatal development of the male reproductive system part the process whereby the reproductive organs sex, mature and are established.

    It begins with a single fertilized egg and culminates 38 weeks later with birth of a male child. It is a part of the stages of sexual differentiation. The development of the male reproductive system coincides with the urinary system. The development of them can also be described together as the development of the urinary and reproductive organs.

    Sexual identity is determined at fertilization when the genetic sex of the zygote has sex initialized by man sperm cell containing either an X or Y chromosome. If this sperm cell contains an Man chromosome it will coincide with the X chromosome mab the ovum and a female child will develop. A sperm cell carrying a Y chromosome results in an XY combination, and a male child will develop.

    Genetic sex determines whether the gonads will be testes or ovaries. In the developing embryo if the testes are developed, it will produce and secrete male sex hormones during late aex development and cause the secondary sex organs of the male to develop. The prostate gland derives from the urogenital sinus, and the other embryonic structures differentiate into the external genitalia. In the absence of testicular secretions, the female genitalia are formed. At six weeks post conception, man differentiation part the external genitalia in the male and female has not taken place.

    At eight weeks, a distinct phallus is present during the indifferent stage. By the 10thth week, the genitalia are distinctly male or female being and derived from their homologous structures. At 16 weeks post conception, the genitalia are formed and distinct. The masculinization of the embryonic reproductive structures occurs as a result of testosterone secreted by the embryonic testes. Testosterone, however, is not the active agent within these organs.

    DHT mediates the androgen effect in these organs. At nine weeks, male differentiation of the gonads and the testes is well underway. Internal changes include the formation of the tubular seminar Chris tubules in the Rete testis from the primary sex cord. Developing on the outside surface of each testis is a Phibro muscular cord called the gubernaculum.

    This structure attaches to the inferior portion of the testis and extends to the labial sacral fold of the same side at the same time, a portion of the embryonic mesonephric duct adjacent to the testis becomes attached and convoluted informs jan epididymis. Another portion part the mesonephritic [ check spelling ] duct becomes sex ductus deferens. The seminal vesicles form from lateral outgrowths of the caudal and of each mesonephritic duct the prostate gland arises from an Indo dermal outgrowth of the urogenital sinus the bulbourethral glands develop from outgrowths man the membrane-like portion of the urethra.

    The descent of the testes to its final location at the anterior abdominal wall, followed by the development of the gubernaculum, which subsequently pulls and translocates the testis down into the developing scrotum. Ultimately, the passageway closes behind the testis. A failure in this process can cause indirect inguinal hernia sex an infantile hydrocoele. Dissent into this not occur until about the 28th week when compared and we know canals form and the abdominal wall to provide openings from the pelvic cavity to the scrotal sac.

    The process by which a testis to send is not well understood but it seems to be associated with the shortening of the gubernaculum, which is attached to the testis and extends to the inguinal canal to the wall of the scrotum as a testis to sense it passes to the side of the mn bladder and anterior to the symphysis pubis.

    It carries with it the ductus deference, that is testicular vessels and nerves, a portion of the abdominal muscle, and lymph vessels.

    All of the structures remain attached to the testis and form what is known as the spermatic cord by the time the testis is in the scrotal sac, the gubernaculum is no more than a remnant of scar like tissue.

    The external genitalia of the male is distinct from those of the female by the end of the ninth week. Prior to that, the genital tubercle in both sexes is a ;art.

    The urethral groove forms on the ventral surface of the phallus early in development during the differentiation of the external genitalia. This is caused by the androgens produced and secreted by the testes. Androgen induced development causes the elongation and differentiation of the phallus into a penis, a fusion of the urogenital folds surrounding the urethral groove along the ventral surface of the penis, and a midline closure of the labioscrotal folds.

    This closure forms the wall of the scrotum the external genitalia. The external genitalia are completely formed by the end of the 12th week. At birth, the development of the prepubertal male reproductive system is completed. During the second trimester of pregnancy, testosterone secretion in the male declines so that at birth the testes are inactive. The genetic sex is determined by whether a Or bearing or part bearing sperm fertilizes the open; the presence or absence of a Y chromosome in turn determines whether ssx gonads of the embryo will be testes or ovaries; and the presence or absence of testes, finally, determines whether the sex accessory organs and man genitalia will be male or female.

    This sequence is understandable in light of the fact that both male and female embryos develop within the maternal environment - high in estrogen secreted by the mother's ovaries and the mzn.

    If estrogen determined the gender, all embryos would become feminized. During puberty, increased gonadotropin secretion stimulates a rise in sex steroids creation from the testes. The increased secretion of testosterone from the testes during puberty xex the male secondary sexual characteristics to be manifested. Secondary development includes the increased activity of the eccrine sweat glands and sebaceous glands along with pary darkening of the skin in the scrotal region.

    Chromosomal abnormalities can occur during fertilization impacting the development of the sex reproductive system. The genotype of the male consists of a Y chromosome paired with an X chromosome. Female gender is determined by the absence of a Y chromosome. Some individuals are male who have the XX male syndrome and androgen insensitivity syndrome.

    This occurs when one X chromosome contains a sex of the Y chromosome, which was inserted into the X man of the father's sperm. Rarely females are born with the XY genotype. They are found to be missing the same portion of the Y chromosome it was inserted into the chromosome of XX males. The gene for sexual differentiation in humanscalled the testis determining factor TDF[19] is located on the short arm of the Y chromosome.

    An abnormal number of sex chromosomes aneuploidy may can occur. The observable, visual differences become apparent between male or the female reproductive organs are not seeing initially. Maturation continues as the medial aspect of each mesonephros grows to form the gonadal ridge. The gonadal ridge continues to grow behind the developing peritoneal membrane.

    By week six, string-like cell congregations called primitive sex cords form within the enlarging sex ridge. Externally, a swelling called the genital tubercle appears above the cloacal membrane.

    External distinctions man not observed even by the part week of pre-embryonic development. This is the indifferent stage during which the gonads are relatively large and sex an outer cortex of primitive sex cords and an inner medulla. Specialized primordial germ cells are forming and migrating from the yolk sac to the embryonic gonads during week eight and nine. These are the spermatagonia in the developing male. Before seven weeks after fertilization, the gonads have the potential to become either testes or ovaries.

    Reproductive sex organs for both male and female are derived from the same embryonic part and are considered homologous tissues or organs. After the testes have differentiated, male sex hormones, called androgens, are secreted from interstitial cells cells of Leydig. The major androgens secreted by these cells is testosterone and secretion begins 8 to 10 weeks after conception.

    Testosterone secretion reaches a peak at 12 to 14 weeks, and declines to very low levels by the end of the second trimester about 21 weeks. Levels are the mna detectable 4—6 months of age postnatal. Internal accessory sex organs to develop and most of these are derived from two systems of embryonic ducts. Male accessory organs are derived from mesonephric wolfian ducts. MIF causes the regression of the paramesonephritic ducts 60 days after fertilization.

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