Path
It arises from the jugular ganglion, and is joined soon after its origin by a filament from the petrous ganglion of the glossopharyngeal; it passes behind the internal jugular vein, and enters the mastoid canaliculus on the lateral wall of the jugular fossa.
Traversing the substance of the temporal bone, it crosses the facial canal about 4 mm (0.16 in) above the stylomastoid foramen, and here it gives off an ascending branch which joins the facial nerve.
The nerve reaches the surface by passing through the tympanomastoid fissure between the mastoid process and the tympanic part of the temporal bone, and divides into two branches:
- one joins the posterior auricular nerve.
- the other is distributed to the skin of the back of the auricula and to the posterior part of the external acoustic meatus.
Read more about this topic: Auricular Branch Of Vagus Nerve
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