Both the corrugator and the platysma pull the eyebrow up. The corrugator muscle has fibers that extend to the lateral part of the eyebrow whereas the procerus has fibers that extend to the medial end of the eyebrow.
A) Both statements are true.
B) The first statement is true; the second is false.
C) The first statement is false; the second is true.
D) Both statements are false.

Question

Quizplus · Accepted Answer

Both the corrugator and the procerus pull an end of the eyebrow down. The corrugator extends to the lateral end of the brow; the procerus extends to the medial end of the brow. Both can express a frown; the procerus can express a frown or a squint.

Both the Corrugator and the Platysma Pull the Eyebrow Up