Revision 8 for 'Paranasal sinuses'

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Paranasal sinuses

The paranasal sinuses consists of, usually, four paired air-filled spaces. They have several functions mainly to reduce the weight of the head, air humidification and to aid in voice resonance. There are named for the facial bones in which they are located:

Variant anatomy

Paranasal sinuses are subject to marked variation between individuals and between sides in the same individual. Paranasal sinus agenesis is rare, and usually involves the frontal sinuses 1

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