Spermatocele

 The penis is firmly anchored to the pelvic floor and on the branches of the pubis. The penile shaft is free to move. It ends in the glans, which is also called the glans penis. About the penis is the penis skin freely movable, which is twice over the glans and foreskin or prepuce is there.
The foreskin of the penis skin consists of two sheets, one from outside the visible outer leaf and inner leaf, which is applied directly to the glans. They are displaced against each other and go on the outer edge of each other. Below the urethra at the glans moves the frenulum (frenulum) approach to the foreskin. It is dimensioned to be a bit short, it can stretch when pulling back the foreskin and the glans downwards.
To perform its function as a reproductive organ, you need to straighten the limb. This process is called an erection. The penis is constructed in the form of three cavernous permit, which is similar to an air cushion can fill with blood and the stiffness and length of the penis. These are the two corpora cavernosa laterally arranged or erectile tissue of the corpus cavernosum penis and corpus spongiosum penis cavernous urethras.

The cavernous urethras runs along the underside of the penis. It starts below the pelvic floor and includes the urethra. Below, it extends down to the glans. The two sides form the penile erectile tissue back. They are separated by a septum septum penis, separated from each other. This dividing wall consists of connective tissue.
Inside the penis cavernous consist of a network of muscles and connective tissues that surround the so-called sinusoids together. The sinusoids are blood-filled spaces. In normal, empty state, these slit-like cavities, and the limb is flaccid. During the blood filling the sinusoids can accommodate up to 40 times the amount of blood. Then they are full to bursting and the penis becomes erect. In contrast to the cavernous urethras of the penis is filled with a dense network of veins.