Otic ganglion
From Wikipedia, the free encyclopedia
| Nerve: Otic ganglion | |
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| The otic ganglion and its branches. | |
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| Mandibular division of trifacial nerve, seen from the middle line. The small figure is an enlarged view of the otic ganglion. | |
| Latin | ganglion oticum |
| Gray's | subject #200 897 |
| Innervates | parotid gland |
| From | lesser petrosal nerve |
| Dorlands / Elsevier |
g_02/12384730 |
The otic ganglion is a small, ovalshaped, flattened parasympathetic ganglion of a reddish-gray color, located immediately below the foramen ovale in the infratemporal fossa.
It is one of four parasympathetic ganglia of the head and neck. (The others are the submandibular ganglion, pterygopalatine ganglion, and ciliary ganglion).
It is occasionally absent.[1]
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[edit] Filaments
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,[2] making up its sensory root.
[edit] 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.
Fibers (postganglionic) from the otic ganglion with which these form synapses are supposed to pass with the auriculotemporal nerve to the parotid gland.
A slender filament (sphenoidal) ascends from it to the nerve of the Pterygoid canal, and a small branch connects it with the chorda tympani.
[edit] Distribution
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.
[edit] Additional images
 Plan of the facial and intermediate nerves and their communication with other nerves. |
 Diagram of efferent sympathetic nervous system. |
[edit] References
- ^ Roitman R, Talmi YP, Finkelstein Y, Sadov R, Zohar Y (1990). "Anatomic study of the otic ganglion in humans". Head Neck 12 (6): 503–6. PMID 2258290.
- ^ Module - Autonomics of the Head and Neck. Retrieved on 2008-03-07.
- Shimizu T (1994). "Distribution and pathway of the cerebrovascular nerve fibers from the otic ganglion in the rat: anterograde tracing study". J. Auton. Nerv. Syst. 49 (1): 47–54. PMID 7525688.
[edit] External links
- Norman/Georgetown cranialnerves (V, IX)
- Otic+ganglion at eMedicine Dictionary
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.
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