¹     You can often feel bones through your skin. Feel your head. Doesn't it feel like a helmet or a hard hat? In a way, it is. This is your skull. Your skull is made of 29 bones.
 
²     Your skull starts out as individual bones. Then the skull fuses together as a baby grows.
 
³     Your cranium is the bowl-shaped, top part of your skull. It protects the brain. It is made of eight smooth bones that fit together tightly. The bones are curved and thin.
 
⁴     Between an infant's cranial bones there are gaps called fontanels. These gaps are covered by a tough membrane instead of bone. This allows the cranium to be squeezed as the baby passes through the birth canal.

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