Which Structure Does Not Drain into the Nasal Cavity

Question

Which structure does not drain into the nasal cavity?
A) ethmoid sinus
B) eustachian tube
C) frontal sinus
D) lacrimal sacs

Accepted Answer

The eustachian tube connects the middle ear to the nasopharynx, but it does not actually drain into the nasal cavity. The ethmoid sinus, frontal sinus, and lacrimal sacs all drain into the nasal cavity.