Innervation of laryngeal muscles exclusive of cricothyroid is provided by which nerve?

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Multiple Choice

Innervation of laryngeal muscles exclusive of cricothyroid is provided by which nerve?

Explanation:
All intrinsic laryngeal muscles except the cricothyroid are supplied by the recurrent laryngeal nerve, a branch of the vagus. The cricothyroid stands out as the exception, being innervated by the external branch of the superior laryngeal nerve. The internal laryngeal nerve is sensory to mucosa above the vocal cords, not motor to muscles, and the superior laryngeal nerve as a whole gives rise to both the sensory internal branch and the motor external branch to cricothyroid. Hence, the motor innervation of the bulk of the intrinsic laryngeal muscles is through the recurrent laryngeal nerve.

All intrinsic laryngeal muscles except the cricothyroid are supplied by the recurrent laryngeal nerve, a branch of the vagus. The cricothyroid stands out as the exception, being innervated by the external branch of the superior laryngeal nerve. The internal laryngeal nerve is sensory to mucosa above the vocal cords, not motor to muscles, and the superior laryngeal nerve as a whole gives rise to both the sensory internal branch and the motor external branch to cricothyroid. Hence, the motor innervation of the bulk of the intrinsic laryngeal muscles is through the recurrent laryngeal nerve.

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