Definition : 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 mucous membranes of the nasal cavity. [MeSH];
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 mucous membranes of the nasal cavity. [MeSH]