Baculum
Cartilage in the penis / From Wikipedia, the free encyclopedia
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Not to be confused with Penile spines.
The baculum (pl.: bacula), also known as the penis bone, penile bone, os penis, os genitale,[1] or os priapi,[2] is a bone in the penis of many placental mammals. It is absent from the human penis, but present in the penises of some primates, such as the gorilla and the chimpanzee.[3][4] The baculum arises from primordial cells in soft tissues of the penis, and its formation is largely influenced by androgens.[5] The bone lies above the urethra,[6] and it aids sexual reproduction by maintaining stiffness during sexual penetration. The homologue to the baculum in female mammals is the baubellum (os clitoridis), a bone in the clitoris.[7][8][9]