Nerve to the stapedius
Encyclopedia
The Nerve to the Stapedius (tympanic branch) arises opposite the pyramidal eminence
Pyramidal eminence
The pyramidal eminence is situated immediately behind the fenestra vestibuli, and in front of the vertical portion of the facial canal; it is hollow, and contains the Stapedius muscle; its summit projects forward toward the fenestra vestibuli, and is pierced by a small aperture which transmits the...

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It passes through a small canal in this eminence to reach the muscle.
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