The pairing of air-filled cavities in the skull are called

Except for the mandible, all skull bones are joined together by sutures —synarthrodial (immovable) joints. The skull contains air-filled cavities called sinuses. Their functions are debatable, but may be related to lessening skull weight, contributing to voice resonance, and warming and moistening inspired air.

Explanation:

Except for the mandible, all skull bones are joined together by sutures —synarthrodial (immovable) joints. The skull contains air-filled cavities called sinuses. Their functions are debatable, but may be related to lessening skull weight, contributing to voice resonance, and warming and moistening inspired air.

Explanation:

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