Pyramidal process
The pyramidal process or eminence of the petrous temporal bone is a small hollow anterior osseous protrusion from the posterior wall of the mesotympanum that separates the sinus tympani medially from the facial recess laterally. The stapedius muscle arises from the hollow of the pyramidal process, passes anterior out of the apex of the pyramidal eminence to attach to the posterior aspect of the neck of the stapes.
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