INBDE (Integrated National Board Dental Examination) Practice Exam

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What nerve provides innervation for the cricothyroid muscle?

  1. Recurrent laryngeal nerve

  2. External laryngeal nerve branch of superior laryngeal nerve

  3. Phrenic nerve

  4. Glossopharyngeal nerve

The correct answer is: External laryngeal nerve branch of superior laryngeal nerve

The external laryngeal nerve branch of the superior laryngeal nerve is responsible for innervating the cricothyroid muscle. The cricothyroid muscle is the only muscle that elongates and tenses the vocal cords, thus playing a crucial role in pitch modulation during speech production. The recurrent laryngeal nerve innervates all intrinsic muscles of the larynx except the cricothyroid muscle. The phrenic nerve is primarily responsible for innervating the diaphragm for breathing. The glossopharyngeal nerve is involved in the innervation of structures in the head and neck region, such as the tongue and throat, but not the cricothyroid muscle specifically.

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