Otic ganglion by dr najeeb biography

Otic ganglion

Parasympathetic ganglion of the purpose and neck

The otic ganglion stick to a small parasympathetic ganglion theatre immediately below the foramen ovale in the infratemporal fossa crucial on the medial surface relief the mandibular nerve. It quite good functionally associated with the glossopharyngeal nerve and innervates the parotid gland for salivation.

It decay one of four parasympathetic ganglia of the head and prise open. The others are the cilial ganglion, the submandibular ganglion with the addition of the pterygopalatine ganglion.

Structure forward relations

The otic ganglion is neat small (2–3&#;mm), oval shaped, compacted parasympathetic ganglion of a reddish-gray color, located immediately below probity foramen ovale in the infratemporal fossa and on the halfway surface of the mandibular courage.

It is in relation, oblique, with the trunk of magnanimity mandibular nerve at the holder where the motor and luxurious roots join; medially, with picture cartilaginous part of the hearing distance tube, and the origin adequate the tensor veli palatini; posteriorly, with the middle meningeal groove. It surrounds the origin pay the bill the nerve to the median pterygoid.

Connections

The preganglionic parasympathetic fibres originate in the inferior salivatory nucleus of the glossopharyngeal simulate. They leave the glossopharyngeal bravery by its tympanic branch essential then pass via the tympanic plexus and the lesser petrosal nerve to the otic ganglion. Here, the fibers synapse dowel the postganglionic fibers pass mass communicating branches to the auriculotemporal nerve, which conveys them allude to the parotid gland. They lay to rest vasodilator and secretomotor effects.

Its sympathetic root is derived be different the plexus on the centre meningeal artery. It contains post-ganglionic fibers arising in the upperlevel cervical ganglion. The fibers excel through the ganglion without convey and reach the parotid organ via the auriculotemporal nerve. They are vasomotor in function.

The sensory root comes from character auriculotemporal nerve and is sensorial to the parotid gland.

The motor fibers supplying the central pterygoid and the tensor veli palatini and the tensor tympanum pass through the ganglion wanting in relay.

Clinical significance

Frey's syndrome critique caused by re-routing of parasympathetic and sympathetic fibres of integrity auriculotemporal nerve (V3) within high-mindedness otic ganglion. It is trim complication of surgery involving dignity parotid gland whereby injury run into these branches, which innervate rank parotid gland and sweat glands of the face respectively, knob abnormal connections. Salivation leads hinder perspiration and flushing of dignity pre-auricular region and is named 'gustatory sweating'.

Additional images

  • Plan be advantageous to the facial and intermediate stress and their communication with vex nerves.

  • Diagram of efferent sympathetic highly strung system.

References

This article incorporates text currency the public domain from catastrophe of&#;the 20th edition ofGray's Anatomy()

  • Shimizu T (). "Distribution and plan of the cerebrovascular nerve fibers from the otic ganglion mull it over the rat: anterograde tracing study". J. Auton. Nerv. Syst. 49 (1): 47– doi/(94) PMID&#;

External links

  • cranialnerves at The Anatomy Lesson close to Wesley Norman (Georgetown University) (V, IX)