Which nerve innervates the muscles of the second pharyngeal arch?

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Study for the Pharyngeal Apparatus Test. Dive into multiple choice questions with detailed explanations and hints. Prepare effectively for your exam!

Multiple Choice

Which nerve innervates the muscles of the second pharyngeal arch?

Explanation:
Muscles from the second pharyngeal arch—the muscles of facial expression along with the stapedius, stylohyoid, and the posterior belly of the digastric—are supplied by the facial nerve (CN VII). This nerve carries the motor fibers from the facial motor nucleus to those muscles as they develop from the second arch, so CN VII is the correct innervation. The trigeminal nerve supplies first-arch muscles (like muscles of mastication), while glossopharyngeal and vagus supply muscles from the third and fourth/sixth arches, respectively, which is why they aren’t correct for the second arch.

Muscles from the second pharyngeal arch—the muscles of facial expression along with the stapedius, stylohyoid, and the posterior belly of the digastric—are supplied by the facial nerve (CN VII). This nerve carries the motor fibers from the facial motor nucleus to those muscles as they develop from the second arch, so CN VII is the correct innervation. The trigeminal nerve supplies first-arch muscles (like muscles of mastication), while glossopharyngeal and vagus supply muscles from the third and fourth/sixth arches, respectively, which is why they aren’t correct for the second arch.

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