Motor innervation to the cricothyroid muscle is supplied by which nerve?

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Multiple Choice

Motor innervation to the cricothyroid muscle is supplied by which nerve?

Explanation:
Cricothyroid is the tensor of the vocal cords, and its motor supply comes from the external branch of the superior laryngeal nerve, a branch of the vagus. The internal branch of the superior laryngeal nerve is sensory to the mucosa above the vocal cords, while the recurrent laryngeal nerve (the other major laryngeal branch of the vagus) innervates all the other intrinsic laryngeal muscles. This makes the external laryngeal nerve unique in providing motor innervation to cricothyroid. Clinically, injury to this branch during thyroid or neck surgery can impair tensioning of the vocal cords, affecting pitch.

Cricothyroid is the tensor of the vocal cords, and its motor supply comes from the external branch of the superior laryngeal nerve, a branch of the vagus. The internal branch of the superior laryngeal nerve is sensory to the mucosa above the vocal cords, while the recurrent laryngeal nerve (the other major laryngeal branch of the vagus) innervates all the other intrinsic laryngeal muscles. This makes the external laryngeal nerve unique in providing motor innervation to cricothyroid. Clinically, injury to this branch during thyroid or neck surgery can impair tensioning of the vocal cords, affecting pitch.

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