Internal laryngeal nerve

Infobox Nerve
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Latin = ramus internus nervi laryngei superioris
GraySubject = 205
GrayPage = 912


Caption = Course and distribution of the glossopharyngeal, vagus, and accessory nerves. (Internal branch of superior laryngeal labeled at center right.)


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BranchFrom = superior laryngeal nerve
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DorlandsPre = r_02
DorlandsSuf = 12690381
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.

A filament descends beneath the mucous membrane on the inner surface of the thyroid cartilage and joins the recurrent nerve.

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.

Pathology

Irritation of the internal laryngeal nerve results in uncontrolled coughing - usually as a result of food or water in the laryngopharynx.

Additional images

External links

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