Which group of sinuses is shaded (screened) in the frontal and lateral views of the illustration below?

Question

Quizplus · Accepted Answer

The shaded (screened) areas in both the frontal and lateral views indicate the presence of the ethmoid sinuses, which are a complex system of small air cells located between the eyes and behind the nose. The other sinuses (maxillary, sphenoid, and frontal) are not shaded in this illustration.

Which Group of Sinuses Is Shaded (Screened) in the Frontal