Facial Anatomy


The face in relation to the overall size of the head evolved from prehuman Australopithecus to modern humans Homo sapiens While the brain and braincase  cranium  tripled in volume, the jaws became shorter and the teeth simpler in shape and size. As a result, the face shrank beneath the brow. Thus, the modern human face has an essentially vertical profile, in contrast to the protruding facial muzzles of gorillas, chimps, and, to a lesser extent, extinct hominids The recession of the tooth-bearing portion of the jaws beneath the forehead left two distinctively human features a prominent, projecting nose and a clearly defined chin


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