Causes

Hemifacial spasm is believed to be due in part to compression of the facial nerve where it meets the brainstem. The compression can be cause by:

• A blood vessel pressing on the facial nerve (most frequent cause)
• Tumor
• Facial nerve injury
• Bony or other abnormalities that compress the nerve

Facial Nerve Innervation

© 2009 Nucleus Medical Art, Inc.

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