Which of these is NOT a paranasal sinus?
a. ethmoidal sinus
b. frontal sinus
c. mastoid sinus
d. maxillary sinus
e. sphenoidal sinus
Answer: C
Biology Questions and Answers.
a. ethmoidal sinus
b. frontal sinus
c. mastoid sinus
d. maxillary sinus
e. sphenoidal sinus
Answer: C