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The Stylomastoid Foramen

MT- mastoid tip, arrow- stylomastoid foramen where the extracranial course of facial nerve begins

3D reconstructed CT-scan showing stylomastoid foramen (arrow). 

[1 - osseous external ear meatus, 2 - stylomastoid process, M - mastoid bone]

 

 3D reconstructed CT-scan showing an elongated styloid process (red arrow) which is implicated in Eagle syndrome.  (white arrow points to stylomastoid foramen where the facial nerve exit the skull)