The Evolutionary Significance of the Ridge-Bone in Primates

Ridge-bone, also known as the sagittal crest, is a bony feature found on the top of the skulls of some primates, including humans. It is a prominent ridge that runs along the midline of the skull, from the front to the back, and is formed by the fusion of several bones in the skull.

The ridge-bone is thought to have evolved as an adaptation for the attachment of muscles that are involved in biting and chewing. In humans, the ridge-bone is not as prominent as it is in other primates, but it can still be felt just above the eyebrows.

In addition to its functional role, the ridge-bone has also been interpreted as a visual cue for social status and dominance in some primate species. For example, in chimpanzees, individuals with more prominent ridges are often seen as more dominant or powerful within their social groups.