Lesser petrosal nerve

Lesser petrosal nerve

Infobox Nerve
Name = Lesser petrosal nerve
Latin = nervus petrosus minor
GraySubject =
GrayPage =


Caption = Plan of the facial and intermediate nerves and their communication with other nerves.


Caption2 = Mandibular division of trifacial nerve, seen from the middle line. The small figure is an enlarged view of the otic ganglion. (Small petrosal labeled at center top and bottom right.)
Innervates = parotid gland
BranchFrom = tympanic plexus
BranchTo = otic ganglion
MeshName =
MeshNumber =
DorlandsPre = n_05
DorlandsSuf = 12566476

The lesser petrosal nerve consists of parasympathetic fibers. It leaves the tympanic plexus to synapse in the otic ganglion, and eventually provide parasympathetic innervation to the parotid gland.

The tympanic plexus has parasympathetic (preganglionic) roots which contribute to the lesser petrosal nerve. Parasympathetic contribution is from the tympanic nerve which branches from the glossopharyngeal nerve (CN IX) in the jugular foramen.

The lesser petrosal nerve exits the temporal bone and enters the middle cranial fossa through the hiatus of lesser petrosal nerve. It then exits the middle cranial fossa through foramen ovale to the otic ganglion where its parasympathetic fibers synapse. From the otic ganglion, its fibers hitchhike with the auriculotemporal nerve (from V3) to eventually innervate the parotid gland.

The geniculate ganglion also communicates with the lesser petrosal nerve.

External links

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