The Nasal Sinuses Serve as Airspaces and Communicate with the Nasal

The nasal sinuses serve as airspaces and communicate with the nasal cavity through the __________.Anteriorly,on each side of the skull,the frontal sinus,the anterior ethmoidal sinus,and the maxillary sinus (antrum of Highmore) drain into the middle meatus; the posterior ethmoid and the sphenoid sinuses drain into the ______________ recess.

A) septum; maxillary
B) middle concha; ethmoidal
C) crista galli; anteriomaxillary
D) meatus; sphenoethmoidal