Definitions for "Paranasal sinuses"
Bony chambers, lined by respiratory epithelium, that open into the nasal cavity; the frontal, ethmoidal, sphenoidal, and maxillary sinuses.
The hollow cavities within the cranial bones that surround and empty into the nasal cavity.
Air-filled extensions of the respiratory part of the nasal cavity into the frontal, ethmoid, sphenoid, and maxillary cranial bones. They vary in size and form in different individuals and are lined by the ciliated mucus membranes of the nasal cavity.