Skull

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A human skull, seen from the front
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A human skull, seen from the front

A skull, or cranium, is a set of bones that make up the head of a vertebrate. Its hard bones keeps the brain safe. Inside the skull are air pockets called sinuses, which act like cushions for the brain. When you have a headache in your forehead, it is usually because the sinuses are filled with fluid due to allergies.

In humans, the adult skull is normally made up of 28 bones. A skull is also used as a symbol of poison when used in conjuction with crossbones.

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Skull