Male reproductive system

The reproductive system and is made up of male sexual organs (prostate, seminal vesicles, urethra proximal) and outer (distal urethra and penis, scrotum and testes) to the body.Its role is twofold: the reproductive function, namely the production and release of sperm into the semen, sexual function, erectile function that allows you to do is type autoerotic activity is eteroerotico type in presence of a partner.Components that originate from the fetus first have to develop according to renal function or blood filtration and urine production, populated by germ cells that later under the guidance of androgens, particularly testosterone and its active form, DHT (dihydrotestosterone) will organize the development of specific structures. The role of male hormones is fundamental because the structures are the same for development in the feminine sense, and if it is missing in a more or less early fetal development, the system can result in abnormal structures or uncoordinated with the genetic sex, as the adrenogenital syndrome. The final part, the urethra, is shared with the excretory system, urinary system (kidney, ureter, bladder), which allows the emptying of the bladder (urinary).The penis
The penis is made from the auction penile-shaped or cylindrical-like truncated pyramid with the apex and base of the glans larger cone-shaped. The skin, with characters of high elasticity, plays all over the body and the distal third (almost to the glans) is folded to form the foreskin covering the glans more or less completely, and the apex of which is connected to the ventral frenulum, more popularly called a thread.

The main structure of both is vascular, called the corpus cavernosum for the auction (there two: cc-corpus cavernosum and the left-right) and bodied spongisoso for luretra and the glans. This is largely a network of vessels communicating with each other: a good supply of blood with a rapid increase in volume and pressure, combined with the rigidity of the covering sheath (especially the tunica albuginea) are the basic conditions for the establishment of the erection.
The auction, therefore, consists of two side cylinders, the corpora cavernosa, surrounded by a sheath of fibrous tissue inelastic, the tunica albuginea and a cylinder median ventral corpus spongiosum, which is placed the spongy or penile urethra . The corpora cavernosa are the dysfunction, the urethra is the channel for urine output, thus connected to the bladder, and sperm, ejaculate, therefore, connected to the ducts that collect the semen from the prostate, seminal vesicles and testes.
The glans penis is the end, useful for its shape to facilitate penetration, with its apex at the urethral opening, the meatus, which is used to issue out of the urine (urination) and sperm ( ejaculation).The testes, the spermatic cord, scrotum
The testicles perform two functions simultaneously, for which we can speak of tubular Functions and Functions endocrina. The first leads to the production of sperm, the second to the secretion of male hormone (androgen) called testosterone.The production of sperm, which is regulated primarily produced by the pituitary hormone called FSH (follicle stimulating hormone) is made from egg-shaped component contained in the seminiferous tubules of the testis called Didymus. The sperm in this forum do not have mobility, are collected and channeled through a long tube that forms the particle that is above the Didymus, that that continues in the epididymis vas deferens in the spermatic cord which runs up to enter the body through the inguinal canal. The deferential in the terminal portion expands nell'ampolla semen.The production and secretion of testosterone is made by groups of cells, Leydig cells present in clumps of tissue between the seminiferous tubules: their activity is regulated primarily produced by the pituitary hormone called LH (luteinizing hormone).
The spermatic cord is a cord made from the blood vessels, nerves, the vas deferens and cremaster muscle, thus connecting the testicle to the rest of the body. The pots are made dall'arteria sperm (from the aorta) that carries blood to the testicle, then the network converges pampiniform vein in the spermatic vein (in part connected with the circuit-iliac pelvic venous system and in part with the renal vein ) that takes away the blood from the testis, the lymphatic network that drains the lifeblood of testicular structures (pelvic lymphatic plexus then converging). The nerves are made up of the transport network of nerve impulses regulating the testicular function and vascular and sensory perception from the testis, the umbilical cord and scrotal structures: they all converge to the pelvic nerve plexus and the lumbosacral nerve roots of the spinal column. The cremaster muscle consists of fibers from the rectus abdominis muscle and its fibers of the cord that are designed to ensure the position of the testicle in the scrotum and abdomen compared.
The scrotum is a sac of skin arising from the abdominal perineal pubic-coated inside by a sheet arising from the abdominal peritoneum called the vaginal tunic divided into a left and a right part, each of which surrounds the testis and their being responsible for the high degree of sensitivity and responsiveness-scrotal testes; it only protects the testis, thanks to a low water table allows the liquid to move the testicle inside the scrotum and that the moderate pressures are more dispersed, the lower pole of the testis there is a fold that connects the scrotum called the gubernaculum testis that holds the testicle in the correct position. The structure contributes to the muscle under the skin of the scrotum thermoregulation of the testis, through phases of expansion, in case of temperature increase with the removal of the testes from the abdominal cavity, and retraction, with reduction in the temperature of the testicles closer to the abdominal cavity . This mechanism is designed to ensure the constancy of the temperature function for the testicles to be at least 1 ° C lower than the abdomen is largely negated by the use of tight clothing such as pants or jeans.

During sexual arousal, the muscles of the scrotal releases and contracts according to the various stages of arousal and testes located close to the body, sometimes even edged up slightly in the inguinal canal itself, in the presence of a certain laxity inguinal ring.The prostate and seminal vesicles
The prostate is a small gland, shaped typically chestnut, more than 3 cm in transverse diameter, anteroposterior diameters, and vesico-urethral maximum 2 cm), located below the bladder and front wall of the intestine before the rectum, so it is with a palpable Digital exploration or visible by ultrasound transrectal probe).
The prostate is practically throughout its length from the first perforated part of the urethra (prostatic urethra), which in its initial part is the funnel neck or vesicles. In the prostate there are two symmetrical side lobes, passing it through the ends of the vas deferens to the channel ending with prostatic urethral at which they stop well short of the ducts of the seminal vesicles.

The prostate is responsible for producing approximately one third of the volume of liquid, while other aspects are still not well known.

The seminal vesicles are small pockets (on average 6 cm x 2 cm) attached to their vas deferens (from which) where they end, participating in the training of scholars ejaculate, are located posterior and inferior to the bladder. The seminal vesicles provide for the production of about two thirds of the volume of the ejaculate, producing among other various nutrients for the sperm, including fructose (the initial fuel for the sperm) and gel-forming proteins that have conservative on sperm function by reducing mobility.