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3. Describe the neurovasculature (arteries and nerves) that serve the larynx.
3. Describe the neurovasculature (arteries and nerves) that serve the larynx.
The larynx is exclusively innervated by the vagus n., specifically by means of the:
Superior laryngeal n.:
External br.
Efferent to cricothyroid m. (intrinsic laryngeal muscle)
Internal br.
Afferent from (and secretomotor to) laryngeal mucosa proximal to vocal folds
Recurrent laryngeal n.:
Efferent to all intrinsic laryngeal mm. (except cricothyroid m.)
Afferent from (and secretomotor to) laryngeal mucosa distal to vocal folds
Blood supply to the larynx comes from two major sources:
Superior laryngeal a. (External carotid a. → Superior thyroid a. → Superior laryngeal a.)
Accompanied by the internal br. of the superior laryngeal n. through the thyrohyoid membrane.
Inferior laryngeal a. (1st part of SCA → Thyrocervical trunk → Inferior thyroid a. → Inferior laryngeal a.)
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