________ Muscles of facial expression
A)First pharyngeal arch
B)Second pharyngeal arch
C)Third pharyngeal arch
D)Fourth pharyngeal arch
E)Sixth pharyngeal arch

Question

Quizplus · Accepted Answer

The muscles of facial expression are derived from the second pharyngeal arch.Other muscles derived from this arch are the stylohyoid,posterior belly of digastric,and stapedius.From the position of the second arch in the embryo,one would not expect it to give rise to facial muscles.During development,the primordial muscle cells (myoblasts)migrate to the head and retain their original nerve supply from the second arch (i.e. ,the facial nerve).

________ Muscles of Facial Expression