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Superior semicircular canal and the petrous portion of the facial (VII) nerve as it enters the internal auditory canal.  This is the narrowest part of the facial nerve and the segment which is felt to be damaged in Bell's Palsy.

Diagram:  I&M:  Body of Incus, Head of Malleus; SSCC: Superior Semicircular Canal;  Petrous Air Cells, Mastoid Air Cells and VII Nerve.

Inner_Ear_Histopathology_046.jpg (479873 bytes)  Inner_Ear_Histopathology_046b.jpg (457703 bytes)
View Highest Resolution-Slide 056 Inner_Ear_Histopathology_056.jpg (515658 bytes)
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This slide shows the superior semicircular canal and the geniculate ganglion of the VII nerve.
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Superior semicircular canal with subarcuate artery. 
Inner_Ear_Histopathology_096.jpg (596696 bytes)

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