Question

fill in the blank question
the hollow spaces located within the frontal, sphenoid, maxillary, and ethmoid bones are called.
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Explanation:

The frontal, sphenoid, maxillary, and ethmoid bones contain hollow spaces. In the context of human anatomy (Medicine and Health sub - field of Natural Science), these specific hollow spaces within these facial and cranial bones are defined as sinuses.

Answer:

sinuses