The intermediate nerve reaches the posterior cranial fossa via the internal acoustic meatus before synapsing in the solitary nucleus. Intracranial lesions occur during the intracranial course of the facial nerve proximal to the stylomastoid foramen. In addition, CT has the advantage of demonstrating the relationship of the facial nerve canal to normal anatomic landmarks such as the ossicles which are not seen on MR. The facial nerve runs in the anterior-superior quadrant of the IAC. Isolated infarcts of the pons. MRI can also reveal enlargement of the facial nerve, as may be seen in a neoplastic process. The labyrinthine segment runs from the fundus of the IAC to the geniculate ganglion.
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Facial Nerve (CN VII)
Transverse temporal bone fracture. Vascular and Other Central Processes Affecting the Facial Nerve A variety of central pathologies can affect the intracranial portion of the facial nerve, including cerebrovascular accident CVAbrain tumors primary and metastaticand multiple sclerosis. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. These sensory afferents then join the parasympathetic fibers, passing via the nervus intermedius to the nucleus tractus solitarius in the medulla. Temporal bone hemangiomas involving the facial nerve.