Dr.Nada Kalil Yaseen
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Anatomy of Facial nerve
1) Intracranial part
• Supranuclear segment
• Nuclear segment
• Infranuclear segment
– Cerebellopontine angle
– Internal acoustic canal
– Labyrinthine segment
– Tympanic segment
– Mastoid segment
2) Extracranial part
Supranuclear segment
• Cerebral cortex Corticobulbar tract
Facial nucleus (pons)
– Upper face crossed & uncrossed
– Lower face crossed only
Nuclear segment
• Facial motor nucleus
– lower 1/3 of Pons
• abducent nucleus
• Out from brain stem at pons recess
between olive and inferior cerebellar
peduncle
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