Get an overview of the male sexual anatomy and male reproductive system. For reproduction to occur, the female sex cell, called the egg, must be fertilized by a male sex cell, called the sperm.
Sexual Health. By Connie Brichford. Last ated: January 21, Also starting at puberty, testicles produce testosteronethe male sex hormone.
The testicles are located below the penis, outside the body, where the appropriate temperature to make sperm may be maintained as it is several degrees too hot for sperm to be viable able to fertilize eggs inside the body. Scrotum - The testicles are covered by a pouch of skin called the scrotum. The scrotum and the muscles surrounding it can pull the testicles toward the body when they are too cold, and relax away from the body when the testicles are too warm.
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 the epididymis.
Another portion of the mesonephritic [ check spelling ] duct becomes the 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 in the membrane-like portion of the urethra.
Male sex organ
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 or 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 urinary 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 penis is the male sex organ, reaching its full size during puberty. In addition to its sexual function, the penis acts as a conduit for urine to leave the body. The penis is made of several. In terms of reproduction, puberty signals the time when a man has fully-functioning sexual organs and is capable of fathering an offspring. The male testes produce spermatozoa (more commonly. The testes are responsible for making testosterone, the primary male sex hormone, and for generating sperm. Within the testes are coiled masses of tubes called seminiferous tubules.
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 phallus.
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.
Male Sex Organs
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 Y bearing or next bearing sperm fertilizes the open; the presence or absence of a Y chromosome in turn determines whether the gonads of the embryo will be testes or ovaries; and the presence or absence of testes, finally, determines whether the sex accessory organs and external 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 placenta. 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 causes the male secondary sexual characteristics to be manifested.
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Secondary development includes the increased activity of the eccrine sweat glands and sebaceous glands along with the darkening of the skin in the scrotal region.
Chromosomal abnormalities can occur during fertilization impacting the development of the male 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 segment of the Y chromosome, which was inserted into the X chromosome 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 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 ct 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 gonadal ridge. Externally, a swelling called the genital tubercle appears above the cloacal membrane.
External distinctions are not observed even by the eighth week of pre-embryonic development. This is the indifferent stage during which the gonads are relatively large and have 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 tissues 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 barely detectable months of age postnatal.
Male Anatomy: The Reproductive Organs
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. Testosterone secretion by the interstitial cells of the testes then causes the growth and development of the mesonephric ducts into male secondary sex organs.
From Wikipedia, the free encyclopedia. This article is about the reproductive system in human males. For the male reproductive systems of other animals, see reproductive system.
Watch Male And Female Sex Organs porn videos for free, here on naturalhealthnwellness.com Discover the growing collection of high quality Most Relevant XXX movies and clips. No other sex tube is more popular and features more Male And Female Sex Organs scenes than Pornhub! Browse through our impressive selection of porn videos in HD quality on any device you own. Male sex organs From the outside, the male has two visible sex organs, the testes (or testicles) and penis. The testes are the primary male sexual organs in that they make sperm and produce testosterone. Jan 21, Male Sexual Anatomy The organs and glands that make up the male sexual anatomy include: Testicles - After puberty, a man's testicles, located at the base of the penis, produce male sex cells called.
Reproductive system of the human male. Main article: Human penis. Main article: Scrotum. Main article: Epididymis. Main article: Vas deferens. Main article: Male accessory gland. Main article: Development of the gonads. Main article: Paramesonephric duct. Main article: Mesonephric duct.
Main article: Puberty. Main article: Chromosome abnormality.