[TA] a conical projection posterior to the vestibular window in the middle ear; it is hollow and contains the stapedius muscle. Synonym(s): pyramid of tympanum, pyramidal eminence, pyramis tympani
em·i·nen·ti·a py·ram·i·da·lis
(em-i-nen'shē-ă pi-ram-i-dā'lis) [TA] A conic projection posterior to the vestibular window in the middle ear; it is hollow and contains the stapedius muscle.