greater petrosal nerve

(redirected from Greater petrosal)

great·er pe·tro·sal nerve

[TA]
a branch from the genu of the facial nerve exiting via the hiatus of the facial canal and running in a groove on the anterior surface of the petrous part of the temporal bone beside the foramen lacerum to join the deep petrosal nerve, thus forming the nerve of the pterygoid canal, which passes through the pterygoid canal to reach the pterygopalatine ganglion.

greater petrosal nerve

a branch of the facial nerve that innervates all the salivary glands above the level of the oral fissure, as well as all mucus glands in the nose and the lacrimal gland in the orbit.

great·er pe·tro·sal nerve

(grā'tĕr pĕ-trō'săl nĕrv) [TA]
A branch from the genu of the facial nerve exiting by way of the hiatus of the facial canal and running in a groove on the anterior surface of the petrous part of the temporal bone beside the foramen lacerum to join the deep petrosal nerve, thus forming the nerve of the pterygoid canal, which passes through the pterygoid canal to reach the pterygopalatine ganglion.
Synonym(s): greater superficial petrosal nerve, nervus petrosus major, parasympathetic root of pterygopalatine ganglion.

great·er pe·tro·sal nerve

(grā'tĕr pĕ-trō'săl nĕrv) [TA]
A branch from the genu of the facial nerve exiting by way of the hiatus of the facial canal and running in a groove on the anterior surface of the petrous part of the temporal bone beside the foramen lacerum to join the deep petrosal nerve, thus forming the nerve of the pterygoid canal, which passes through the pterygoid canal to reach the pterygopalatine ganglion.
Synonym(s): greater superficial petrosal nerve, nervus petrosus major, parasympathetic root of pterygopalatine ganglion.
References in periodicals archive ?
5) Because the greater petrosal nerve is rarely discernible on CT and magnetic resonance imaging (MRI), these imaging modalities confer no benefit for the purpose of preoperative planning.
The geniculate ganglion is located by identifying the greater petrosal nerve at the facial hiatus and following it posterolaterally with a small diamond drill and constant suction and irrigation.
The surgical technique involves exposure of the geniculate ganglion, the greater petrosal nerve, and the facial nerve from the cochleariform process to the cerebellopontine angle via the middle cranial fossa approach.
The greater petrosal nerve stump is cut away so that a 5-mm segment is excised.
At the time of exposure of the greater petrosal nerve and geniculate ganglion, it was not recognized that there was no bone over this area, a finding that in seen in 5% of patients.
All 64 patients had a permanently non-crying eye on the involved side as a result of the excision of the greater petrosal nerve.
The temporal lobe dura was elevated, and bone was removed from the greater petrosal nerve, geniculate ganglion, internal genu, labyrinthine portion of the facial nerve, and upper portion of the internal auditory canal until a good view was obtained into the cerebellopontine angle.

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