- Otic ganglion
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. Latin ganglion oticum Gray's subject #200 897 Innervates parotid gland From lesser petrosal nerve
The otic ganglion is a small, oval shaped, flattened parasympathetic ganglion of a reddish-gray color, located immediately below the foramen ovale in the infratemporal fossa. It gives innervation to the parotid gland for salivation.
It is occasionally absent.
Filaments that pass through the ganglion without synapsing:
- Nerve to tensor tympani (coming from the trigeminal nerve motor nucleus)
- Nerve to tensor veli palatini (coming from the trigeminal nerve motor nucleus)
- Nerve to levator veli palatini (coming from facial nerve thought to run through the chorda tympani)
Branches of communication
Its sympathetic postganglionic fibers consists of a filament from the plexus surrounding the middle meningeal artery.
Preganglionic parasympathetic fibres reach it from the glossopharyngeal nerve (and possibly also from the facial nerve) via the lesser petrosal nerve continued from the tympanic plexus. Postganglionic parasympathetic fibres from the ganglion pass with the sympathetic fibres mainly in the auriculotemporal nerve (a branch of CN V3 -- the Mandibular branch of the Trigeminal Nerve) to supply the parotid gland. All postsynaptic parasympathetics will use some branch of the Trigeminal Nerve to get from one of four parasympatheic ganglia (Otic, Ciliary, Submandibular, and Peteryopalatine) to their destination in either smooth muscle or glandular tissue (secretomotor).
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.
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 (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. doi:10.1016/0165-1838(94)90019-1. PMID 7525688.
- cranialnerves at The Anatomy Lesson by Wesley Norman (Georgetown University) (V, IX)
- Otic+ganglion at eMedicine Dictionary
Nerves of head and neck: the cranial nerves and nuclei (TA A14.2.01, GA 9.855) olfactory (AON->I) optic (LGN->II) oculomotor
trochlear (TN->IV)no significant branches trigeminal
(PSN, TSN, MN, TMN->V)
abducens (AN->VI)no significant branches facial (FMN, SN, SSN->VII)near origininside
(NA, ISN, SN->IX)before jugular fossaafter jugular fossa
(NA, DNVN, SN->X)before jugular fossaafter jugular fossa
accessory (NA, SAN->XI) hypoglossal (HN->XII) The cranial nerves: trigeminal nerve ophthalmic
(V2)in meningeson face
Nerves – autonomic nervous system (sympathetic nervous system/ganglion/trunks and parasympathetic nervous system/ganglion) (TA A14.3, GA 9.968) Head/
Pterygopalatine ganglion: deep petrosal · nerve of pterygoid canal
branches of distribution: greater palatine (inferior posterior nasal bdddeeranches) · lesser palatine · nasopalatine (medial superior posterior nasal branches) · pharyngeal
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