|Nerve: Otic ganglion|
|The otic ganglion and its branches.|
|Mandibular division of trifacial nerve, seen from the middle line. The small figure is an enlarged view of the otic ganglion.|
|Gray's||subject #200 897|
|From||lesser petrosal nerve|
Location and relations
It surrounds the origin of the nerve to the Pterygoideus internus.
It is in relation, laterally, with the trunk of the mandibular nerve at the point where the motor and sensory roots join; medially, with the cartilaginous part of the auditory tube, and the origin of the Tensor veli palatini; posteriorly, with the middle meningeal artery.
Functionally, it gives off filaments:
- posteriorly on the lateral surface of the Eustachian tube to the tensor tympani
- anteriorly to the tensor palati muscle
- to the inferior maxillary nerve, making up its motor root.
- to the auriculotemporal nerve, making up its sensory root.
Branches of Communication
It is connected by two or three short filaments with the nerve to the Pterygoideus internus, from which it may obtain a motor, and possibly a sensory root.
It communicates with the glossopharyngeal and facial nerves, through the lesser superficial petrosal nerve continued from the tympanic plexus, and through this nerve it probably receives a root from the glossopharyngeal and a motor root from the facial; its sympathetic root consists of a filament from the plexus surrounding the middle meningeal artery.
The fibers from the glossopharyngeal which pass to the otic ganglion in the small superficial petrosal are supposed to be parasympathetic efferent (preganglionic) fibers from the dorsal nucleus or inferior salivatory nucleus of the medulla.
Its branches of distribution are: a filament to the Tensor tympani, and one to the Tensor veli palatini.
The former passes backward, lateral to the auditory tube; the latter arises from the ganglion, near the origin of the nerve to the Pterygoideus internus, and is directed forward.
The fibers of these nerves are, however, mainly derived from the nerve to the Pterygoideus internus.
- Shimizu T., "Distribution and pathway of the cerebrovascular nerve fibers from the otic ganglion in the rat: anterograde tracing study."; J Auton Nerv Syst. 1994 Sep;49(1):47-54. 
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.