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hichkok12 [17]
3 years ago
11

A sinus is defined as?

English
2 answers:
Natali5045456 [20]3 years ago
8 0
A cavity within a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities.
12345 [234]3 years ago
5 0

Answer:

An air-filled cavity in a dense portion of a skull bone. The sinuses decrease the weight of the skull. The sinuses are formed in four right-left pairs. The frontal sinuses are positioned behind the forehead, while the maxillary sinuses are behind the cheeks.

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