Human reproductive system - The female reproductive system: The female gonads, or sexual glands, are the ovaries; they are the source of ova (eggs) and of. The human reproductive system usually involves internal fertilization by sexual intercourse. A small proportion of the sperm pass through the cervix into the uterus, and then into the Fallopian tubes for fertilization of the ovum. Only one sperm is required to fertilize the ovum.Structure · Male · Female · Development. An overview of the male reproductive system from the experts at WebMD.
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Human reproductive system ejaculatory ducts empty into the urethra. The urethra is the tube that carries urine from the bladder to outside of the body. In males, human reproductive system has the additional function of 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. The seminal vesicles are sac-like pouches that attach to the vas deferens near the base of the bladder. The seminal vesicles produce a sugar-rich fluid fructose that provides sperm with a source of energy to help them move.
The fluid of the seminal vesicles makes up most of the volume of a man's ejaculatory fluid, or ejaculate. The prostate gland is human reproductive system walnut-sized structure that is located below the urinary bladder in front of the rectum.
The prostate gland contributes additional fluid to the ejaculate.
The Male Reproductive System
Prostate fluids also help to nourish the sperm. The structure of the tissue of the corpus spongiosum is similar to that of the corpora cavernosa, but there is more human reproductive system muscle and elastic tissue. A deep fascia, or sheet of connective tissuesurrounding the structures in the body of the penis is prolonged to form the suspensory ligament, which anchors the penis to the pelvic bones at the midpoint human reproductive system the pubic arch.
The penis has a rich blood supply from the internal pudendal artery, a branch of the human reproductive system iliac artery, which supplies blood to the pelvic structures and organs, the buttocks, and the inside of the thighs.
Human reproductive system - The female reproductive system |
Erection is brought about by distension of the cavernous spaces with blood, which is prevented from draining away by compression of the veins in the area. The penis is amply supplied with sensory and autonomic involuntary nerves.
Of the autonomic nerve fibres the sympathetic fibres cause constriction of blood human reproductive system, and the parasympathetic fibres cause their dilation.
It is usually stated that ejaculation is brought about by the sympathetic system, which at the same time inhibits the desire to urinate and also prevents the semen from entering the bladder. The scrotum The scrotum is a pouch of human reproductive system lying below the pubic symphysis and just in front of the upper parts of the thighs.
It contains the testes and lowest parts of the spermatic cord.
Human reproductive system | Definition, Diagram & Facts |
A scrotal septum or partition divides the pouch into two compartments and arises from a ridge, or raphe, visible on the outside of the scrotum. The raphe turns forward onto the undersurface of the penis and is continued back onto the perineum the area between the legs and as far back as the anus.
This arrangement indicates the bilateral human reproductive system of the scrotum from two genital swellings that lie one on each human reproductive system of the base of the phallus, the precursor of the penis or clitoris in the embryo. The swellings are also referred to as the labioscrotal swellings, because in females they remain human reproductive system to form the labia majora and in males they unite to form the scrotum.
The skin of the scrotum is thin, pigmented, devoid of fatty tissueand more or less folded and wrinkled. There are some scattered hairs and sebaceous glands on its surface. Below the skin is a layer of involuntary muscle, the dartos, which can alter the appearance of the scrotum.
Human reproductive system
On exposure of the scrotum to cold air human reproductive system cold water, the dartos contracts and gives the scrotum a shortened, corrugated appearance; warmth causes the scrotum to become smoother, flaccid, and less closely tucked in around the testes.
Beneath the dartos muscle are layers of fascia continuous with those forming the coverings of each of the two spermatic cords, which suspend the testes within the scrotum and contain each ductus deferens, the testicular blood and lymph vessels, the artery to human reproductive system cremaster muscle which draws the testes upwardthe artery to each ductus deferens, the genital branch of the genitofemoral nerve, and the testicular network human reproductive system nerves.
The scrotum is supplied with blood by the external pudendal branches of the femoral arterywhich is the chief artery of the thigh, and by the scrotal branches of the internal human reproductive system artery.
The veins follow the arteries.
The lymphatic drainage is to the lymph nodes in the groin. The testes The two testesor testicles, which usually complete their descent into the scrotum human reproductive system their point of origin on the back wall of the abdomen in the seventh month after conceptionare suspended in the scrotum by the spermatic cords.
Each testis is 4 to 5 cm about 1. This sac is lined internally by the tunica vasculosa, containing a network of blood vessels, and is covered by human reproductive system tunica vaginalis, which is a continuation of the membrane that lines the abdomen and pelvis.