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The '''cranium''' is the bones of the [[skull]] which contain the brain.
The ''cranium'' is one of the two primary bones which constitute the [[skull]]. Its primary purpose is to contain and protect the brain.
== Cranium Size ==
It has been demonstrated experimentally that cranium thickness is inversely proportional to brain size in many vertebrate species, including [[Homo Sapiens]]. There are many theories which explain why this is the case, but it is generally accepted that more primitive species engage in more violent behaviour, and that cranium thickness within each species was individually designed to protect the members of that species.