Which of the Following Best Describes the Orbicularis Oris

Question

Which of the following best describes the orbicularis oris?
A) it pulls the lower lip down and back
B) it closes, purses, and protrudes the lips
C) it allows blinking and squinting of the eyes
D) it draws the eyebrows together

Accepted Answer

The orbicularis oris is the muscle that encircles the mouth and is responsible for closing, pursing, and protruding the lips. It does not pull the lower lip down and back (A), allow blinking and squinting of the eyes (C), or draw the eyebrows together (D).