Penis synonyms

The penis is very large, cylindrical, with a truncated, expanded, flattened termination.

The skin of the penis forms a fold which covers the glans and is known as the prepuce or foreskin; when this is drawn back a median fold, the frenuluni praeputii, is seen running to just below the meatus.

The penis, and its much reduced vestige of the female, is developed from the ventral wall of the proctodaeum.

Insemination takes place either by the introduction of the penis into the cloaca of the female, or by the puncture of the bodywall of the female by the penis, and the injection of the sperm into the body cavity, whence the single spermatozoa must make their way to the eggs.

The spongy urethra is that part which is enclosed in the penis after piercing the anterior layer of the triangular ligament.