Penis is a unique human organ having many functions. In a state of erection penis is used as the copulatory organ necessary for reproduction. Penis is located on the front part of pelvis suspended from the perineum. Combined with the scrotum penis make up the external male genitalia.

As a copulative organ penis responds to any sexual stimulation. Its muscle relaxes and penis gets filled with blood. The tissue structure of the penis allows containing extra blood without permitting it to escape. This way erection is created.

The proximal attached root firmly holds the penis at the pubic arch. The root of the penis creates both the crus of the penis as well as the bulb of the penis. The bulb of the penis is placed within the perineum in the urogential triangle and surrounded by the bulbocavernosus muscle. The main function of the crus surrounded by ischiocavernosus muscle is attaching the penis to the male body.
The body of the penis consists of 3 column of fibrous tissue placed within the skin.  The corpora cavernosa of the penis are two equal dorsal masses.  

Two major states of the penis are flaccid and engorged depending on nerve function including sexual arousal. In the flaccid pendant position the penis is rather vulnerable. The area of the penis is extremely sensitive. Any pain caused to it cripples the male for a while. At the same time the urethra is more protected and can be injured only by significant compression.  

The glans of the penis is the major part of the organ. It has a distinctive cone shape consisting of the expanded corpus spongiosum. At the tip of the glans there is the urethral opening known as the urethral orifice. The glans of the penis is distinguished by posterior ridge. The skin of the penis is special. It had no specific elements typically found in skin. No fat cells, no hair, no consistent pigmentation.  What is more the skin of the penis has a loose covering. The retractable part of skin covering the glans is known as the foreskin, or prepuce. Some religions have this skin permanently removed at birth, as a rule it is circumcised.

There is a special femoral artery as well as internal pudendal branch of the internal iliac artery supplying the penis with blood. The draining of blood occurs through the superficial medial dorsal vein flowing into the great saphenous vein located in the thigh.

The penis is extremely sensitive as it has many tactile sensory receptors. In fact, it is the most sensitive organ on the male human body. What is more, the glans is the most sensitive part of the penis! No wonder the penis is nearly always responding to any positive tactile stimulation. That is exactly why normal functioning of the organ is vitally important for any man.

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