Simian shelf

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The simian shelf is a bony thickening on the front of the ape mandible.[1] Its function is to reinforce the jaw,[2] though it also has the effect of considerably reducing the movement of the tongue by restricting the area available for muscles.[3]

Humans are the only primates to have protruding chins, though some fossils of early humans show evidence of a simian shelf.[4]

References

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