Anatomy Answers-3

(C) The posterior digastric muscle is derived
from the second branchial arch and thus is innervated
by its nerve, the facial (Seventh cranial)
nerve. The anterior digastric muscle (choice A) is
derived from the first branchial arch and is innervated
by its nerve, the mandibular division of the
trigeminal (fifth cranial) nerve. The posterior
cricoarytenoideus muscle (choice B) and the
superior constrictor muscle (choice E), derived
from a combination of the fourth and sixth
branchial arches, are innervated by the vagus
(tenth cranial) nerve. The stylopharyngeus
(choice D) is derived from the third branchial
arch and is the only voluntary muscle innervated
by the glossopharyngeal (ninth cranial) nerve.

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