Internal laryngeal nerve
|Nerve: Internal laryngeal nerve|
|Course and distribution of the glossopharyngeal, vagus, and accessory nerves. (Interal branch of superior laryngeal labeled at center right.)|
|Latin||ramus internus nervi laryngei superioris|
|Gray's||subject #205 912|
|From||superior laryngeal nerve|
The internal laryngeal nerve is the internal branch (ramus internus) of the superior laryngeal nerve. It descends to the hyothyroid membrane, pierces it in company with the superior laryngeal artery, and is distributed to the mucous membrane of the larynx.
Of these (sensory) branches some are distributed to the epiglottis, the base of the tongue, and the epiglottic glands; others pass backward, in the aryepiglottic fold, to supply the mucous membrane surrounding the entrance of the larynx, and that lining the cavity of the larynx as low down as the vocal folds.
Above the vocal folds the sensory innervation of the larynx is via the internal laryngeal nerve. Below the vocal folds it is by way of branches of the recurrent laryngeal nerve.
Irritation of the internal laryngeal nerve results in uncontrolled coughing - usually as a result of food or water in the laryngopharynx.