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The skeleton is the body part that forms the supporting structure of many vertebrates, including humans. The human skeleton is made up of more than 200 bones, weighing some 18% of the total body weight. The cranium is made up of 23 bones of which only two, the mandible and the tongue bone, are moveable. The other bones are all connected with non-moveable joints. The function of the cranium is to protect the brain by acting as a natural 'helmet'.