Baculum - Wikipedia The baculum is an exclusive characteristic of placentals and closely related eutherians, being absent in other mammal clades, and it has been speculated to be derived from the epipubic bones more widely spread across mammals, but notoriously absent in placentals
Baculum | Mammalian Skeleton, Rod-Shaped Bone, Penis Bone | Britannica baculum, the penis bone of certain mammals The baculum is one of several heterotropic skeletal elements— i e , bones dissociated from the rest of the body skeleton It is found in all insectivores (e g , shrews, hedgehogs), bats, rodents, and carnivores and in all primates except humans
Why humans lost their penis bone - Science | AAAS The baculum first evolved between 145 million and 95 million years ago, the team reports online today in the Proceedings of the Royal Society B That means it was present in the most recent common ancestor of all primates and carnivores
Why don’t humans have a penis bone? - BBC Science Focus Magazine The penis bone or ‘baculum’ is common to lots of placental mammals but by no means all of them It seems to have evolved independently nine times in different mammal lineages but it has also subsequently been lost in many cases
The Baculum was Gained and Lost Multiple Times during Mammalian . . . The penis of many mammalian species contains a baculum, a bone that displays astonishing morphological diversity The evolution of baculum size and shape does not consistently correlate with any aspects of mating system, hindering our understanding of the evolutionary processes affecting it
The baculum: Current Biology - Cell Press What is a baculum? The baculum (os penis) is a bone found within the penis of certain mammals, including many primates, rodents, bats, carnivores, and some insectivores It is an isolated bone, derived from connective tissue and located at the distal end of the penis, above the urethra