| tympanum | 1. <anatomy> Loosely, the tympanic membrane (membrana tympani). 2. The tympanic cavity (cavitas tympanica). Origin: L., Gr. Tympanon = drum (13 Nov 1997) |
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| membrane of tympanum | <anatomy> The eardrum. (13 Nov 1997) |
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| roof of tympanum | The roof of the middle ear, formed by the thinned anterior surface of the petrous portion of the temporal bone. Its anterior edge is inserted into the petrosquamous fissure so that it can be seen as a wedge of bone subdividing that fissure into a squamo tympanic and a petrotympanic fissure. Synonym: roof of tympanum. (05 Mar 2000) |
| cord of tympanum | chorda tympani |
| pyramid of tympanum | A conical projection posterior to the vestibular window in the middle ear; it is hollow and contains the stapedius muscle. Synonym: pyramid of tympanum, pyramidal eminence, pyramis tympani. (05 Mar 2000) |