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Skull
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For other uses of "Skull", see
Skull (disambiguation).
"Cranium" redirects here. For other uses, see
Cranium (disambiguation).
Volume rendering of a
Mouse skull
The skull is a
bony structure in the
head of many
animals that supports the structures of the
face and forms a
cavity for the brain.
The skull is composed of two parts: the cranium and the
mandible. A skull without a mandible is only a cranium. Animals that have skulls are called
craniates. The skull is a part of the
skeleton.
Functions of the skull include protection of the
brain, fixing the distance between the eyes to allow
stereoscopic vision, and fixing the position of the ears to help the brain use auditory cues to judge direction and distance of sounds. In some animals, the skull also has a defensive function (e.g. horned
ungulates); the
frontal bone is where horns are mounted.
The English word "skull" is probably derived from
Old Norse "
skalli" meaning
bald, while the word cranium comes from the
Greek root ??????? (kranion).
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