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Facial nerve: from anatomy to pathology
F Toulgoat1, J L Sarrazin, F Benoudiba
1Neuroradiologie diagnostique et interventionnelle, Hôpital Laennec, CHU de Nantes, boulevard Jacques-Monod - Saint-Herblain, 44093 Nantes cedex 1, France.
Diagnostic and Interventional Imaging
|July 30, 2013
Summary
The facial nerve (CN VII) originates in the pons and travels through complex pathways, including the petrous bone. Lesions can affect CN VII and CN VIII, with Bell
Area of Science:
- Neuroscience
- Anatomy
- Neurology
Background:
- The facial nerve (CN VII) originates in the pons and has a complex anatomical course.
- It travels with the vestibulocochlear nerve (CN VIII) through the cisternal and internal auditory meatus pathways.
- The nerve traverses the petrous bone via labyrinthine, tympanic, and mastoid segments before exiting at the stylomastoid foramen.
Purpose of the Study:
- To outline the anatomical course and key pathways of the facial nerve (CN VII).
- To describe the clinical implications of lesions affecting the facial nerve.
- To differentiate between central and peripheral facial nerve impairments.
Main Methods:
- Anatomical review of the facial nerve (CN VII) pathway.
- Discussion of neurological deficits associated with facial nerve lesions.
- Clinical correlation of pontine, cerebellopontine angle, and peripheral facial nerve impairments.
Main Results:
- Pontine lesions of the facial nerve (CN VII) typically present with additional neurological symptoms.
- Cerebellopontine angle tumors (e.g., meningioma, schwannoma) primarily affect CN VIII, with secondary involvement of CN VII.
- Peripheral facial nerve impairment, excluding trauma, is most commonly attributed to Bell's palsy.
Conclusions:
- Understanding the facial nerve's (CN VII) intricate anatomy is crucial for diagnosing neurological disorders.
- Lesion location dictates the pattern of cranial nerve involvement, with cerebellopontine angle and pontine lesions having distinct presentations.
- Bell's palsy remains the most frequent cause of isolated peripheral facial nerve dysfunction.
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