Which nerve innervates the stapedius muscle?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which nerve innervates the stapedius muscle?

Explanation:
The stapedius muscle is innervated by a branch of the facial nerve, specifically the nerve to stapedius, which travels through the middle ear to motorly innervate the stapedius. This small muscle helps dampen vibrations of the stapes to protect the inner ear from loud sounds, a key part of the acoustic reflex. The other nerves listed do not supply stapedius: the tensor tympani is innervated by the mandibular division of the trigeminal nerve (CN V), while CN IX and CN X innervate other pharyngeal and laryngeal muscles and structures. Therefore, cranial nerve VII is the correct innervation.

The stapedius muscle is innervated by a branch of the facial nerve, specifically the nerve to stapedius, which travels through the middle ear to motorly innervate the stapedius. This small muscle helps dampen vibrations of the stapes to protect the inner ear from loud sounds, a key part of the acoustic reflex. The other nerves listed do not supply stapedius: the tensor tympani is innervated by the mandibular division of the trigeminal nerve (CN V), while CN IX and CN X innervate other pharyngeal and laryngeal muscles and structures. Therefore, cranial nerve VII is the correct innervation.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy