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Tympanic sinus. Sinus tympani. Deep fossa behind the promontory and round window. D Round window (fenestra of cochlea). Fenestra cochleae [[rotunda]]. Round opening at the end of the scala tympani. It is closed by the secondary tympanic membrane. D Fossula of round window. Fossula fenestrae cochleae. Small fossa leading into the round window. D

Crest of round window. Crista fenestrae cochleae. Bony ridge along the edge of the round window for attachment of the secondary tympanic membrane. D Cochleariform process. Processus cochleari-formis. Spoon-shaped bony process found above the promontory at the end of the semi-canal for the tensor tympani muscle. In combination with a connective tissue loop, it serves as a pulley for the muscle. D Secondary tympanic membrane. Membrana tympani secundaria. Sheath across the round window that forms a membranous partition between the scala tympani and the tympanic cavity.

Mastoid wall. Paries mastoideus [adnexa mas-toidea]. Components connected with the mas-toid process.

Mastoid (posterior) wall. Paries mastoideus. Posterior wall of middle ear cavity facing the mastoid process. D

Mastoid antrum. Antrum mastoideum. Closed space, the posterosuperior part of which is continuous with the tympanic cavity. The inferior edge communicates with the mastoid cells. D Aditus ad antrum. Entrance to the mastoid antrum from the tympanic cavity. D Prominentia canalis semicircularis lateralis. Prominence on the wall of lateral semicircular canal, situated above the prominence of the facial canal. D

Prominence of facial nerve canal. Prominentia canalis facialis. Bulge lying between the oval window and prominence of the lateral semicircular canal. D

Pyramidal eminence (pyramid). Eminentia pyramidalis. Small, bony pyramidal projection at the level of the oval window. Its apex is perforated. The eminence contains the stapedius muscle, the tendon ofwhich emerges from it. D Incudal fossa. Fossa incudis. Small depression in the aditus ad antrum for the posterior ligament of the incus. D

Sinus posterior. Small groove between the in-cudal fossa and pyramid. D

Typmpanic aperture of canaliculus of chorda tympani. Apertura tympanica canaliculi chordae tympani. Opening of chorda tympani canal into tympanic cavity. It lies at the posterior margin of the tympanic membrane at the level of the pyramid. D

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