Friday, December 19, 2014

Physiology Of Penis

The lnternal structure of the penis consists of two cylinder shaped vascular tissue bodies cosoracavernosa,that throughout the penis.the urethra (tube for expelling urine and ejaculate).
 The corpora cavernosa are two chambers that fill most of the penis. The chambers are fill with a spongy tissue that includes muscles,open spaces veins and arteries. An erection occurs when the corpora cavernosa become engorged with blood and expand.
The Tunical Albuginea- A membrane called the tunica albuginea surrounds the corpora cavernosa. This membrane helps keep blood in the penis during an erection.
Urethra- The urethra is the tube through which urine travels Ejaculation also travels through the urethra.
Corpus spongiosum- The corpus Spongiosum is a chamber that surroumds the urethra. It become engorged with blood during an erection.
The prostate- The prostate is a small gland located in the pelvis it surrounds the urethra and plays an lmportant role in ejaculation. Sperm,which is produced in the testicles and stored in the seminal vesicles, is mixed with prostatic fluid and secretion from the bulbourethral gland to form semen. During ejaculation,semen is expelled through the urethra from the ejaculatory ducts.
AROUSAL- This phase starts with some kind of sexual stimulation a touch,a sight,or a thought. Blood begin to move to various parts of the body. The lips, nipples (some times nipple become erect),earlobe and genitals become fuller and more sensitive. The penis begin to fill with blood and become erect,and the scrotum starts to thicken,pulling the testicles closer to the man's body.
PLATEAU- With continued stimulation the penis become slightly firmer, may darken in color,and fluid containing sperm begin to seepout over long period of foreplay,the penis may become flaccid and then harden again.This is perfectly normal. Even if the penis stay erect.firmness will wax and wane to some degree. The scrotum contines to thicken and the testes start to enlarge. The right testicle will rise and slightly rotate first,then the left will do the same, Heart rate and blood pressure will increase, Breathing and heart rate lncrease and moans or other sounds may be made.
As climax approaches the skin of the gland darkens and becomes tight and the urethral opening may slightly open lmmediately before ejaculation at the point of no return the sphincter from the bladder closes so that semen can't more into the bladder and prostate and seminal vesicle contract to move semina fluid to the urethra bulb near the base of the penis.

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