Composition
The penis is composed of three independent cylinders (Fig. 1.1.). The two parallel cylinders, known as the corpus cavemosum produce penile erection . Both cylinders communicate with each other for about three quarters of their length through small holes between the penile cylinders. (This is why penile injections given only in the shaft or cylinder). These cylinders, splits, when approaching the body and is attached to the pelvic bone with a thick membrane. Furthermore, each cylinder is covered with a resistant cover which is called the tunica albuginea. The penis is surrounded by another membrane, which when filled with blood under pressure, creates a firm and able to penetrate.
Penis third cylinder is the ” corpus spongiosum “containing penile urethra . Woven around this part of the erect penis is much thinner, and the cylinder is placed in the groove created by the other two. As the structure approaches the end it becomes thicker, and ends up as head of the penis. Finally in the area closest to the human body expands the corpus spongiosum ends at the small gonads thyroid bulbo-urethralis. The three cylinders are covered with a thick and resistant membrane called Buck’s late. Finally, a last layer that covers this area, Colles tendon or superficial. This continues up the abdominal wall and give the whole structure of a solid prop that also makes it strong and hard.
The skin covering the penis is extremely mobile and flexible. This is necessary to permit that can produce erections . Penis skin is unique in this context and controlled by the hormonal system. Penis head is an anatomical structure, different from the others and covered in foreskin. This is a double layer of freely moving penile skin, which come on after the penis needs, it is very sensitive to any kind of swelling or trauma. Therefore, the skin may increase very rapidly, by even a small injury.
