External laryngeal nerve

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Nerve: External laryngeal nerve
Course and distribution of the glossopharyngeal, vagus, and accessory nerves. (External branch of superior laryngeal labeled at center right.)
Latin ramus externus nervi laryngei superioris
Gray's subject #205 912
From superior laryngeal nerve
Dorlands/Elsevier r_02/12690066

The external laryngeal nerve is the smaller, external branch (ramus externus) of the superior laryngeal nerve. It descends on the larynx, beneath the sternothyroid muscle, to supply the cricothyroid muscle.

It gives branches to the pharyngeal plexus and the superior portion of the inferior pharyngeal constrictor, and communicates with the superior cardiac nerve behind the common carotid artery.

The external branch is susceptible to damage during thyroidectomy, as it lies immediately deep to the superior thyroid artery.

v • d • e
Nerves of head and neck: the cranial nerves
I-IV olfactory • optic • oculomotor (superior branch, inferior branch) • trochlear
V: trigeminal trigeminal ganglion • ophthalmic • maxillary • mandibular
VI: abducens no significant branches
VII: facial nervus intermedius • geniculate • inside facial canal (greater petrosal, nerve to the stapedius, chorda tympani) • at exit from stylomastoid foramen (posterior auricular, digastric • stylohyoid) • on face (temporal, zygomatic, buccal, mandibular, cervical)
VIII: vestibulocochlear cochlear (striae medullares, lateral lemniscus) • vestibular (Scarpa's ganglion)
IX: glossopharyngeal nucleus ambiguus • ganglia (superior, petrous) • tympanic (tympanic plexus, lesser petrosal) • carotid sinus • pharyngeal branches • pharyngeal plexus
X: vagus ganglia (jugular, nodose) • in the jugular fossa (meningeal branch, auricular branch) • in the neck (pharyngeal branch, superior laryngeal ext and int, recurrent laryngeal, superior cervical cardiac) • in the thorax (inferior cardiac, pulmonary branches, anterior vagal trunk, posterior vagal trunk) • in the abdomen (celiac branches - renal branches - hepatic branches of anterior vagal trunk - anterior gastric branches of anterior vagal trunk - posterior gastric branches of posterior vagal trunk)
XI-XII accessory • hypoglossal
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Retrieved from "http://en.wikipedia.org/wiki/External_laryngeal_nerve"
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