hemipenes

Hemipenes are the paired reproductive organs of male snakes and lizards. They are usually held inverted, within the body, and are everted for reproduction via erectile tissue like that in the human penis. Only one is used at a time, and some evidence indicates males alternate use between copulations. The hemipene itself has a variety of shapes, depending upon species. Often the hemipene bears spines or hooks, in order to anchor the male within the female. Some species even have forked hemipenes (each hemipene has two tips). Due to being everted and inverted, hemipenes do not have a completely enclosed channel for the conduction of sperm, but rather a seminal groove which seals as the erectile tissue expands.

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