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M. tensortympani. Muscle located in the sem-icanal for the tensor tympani muscle above the auditory tube. Its tendon bends laterally around the cochleariform process almost at a right angle and inserts at the base of the manubrium of the malleus. I: Mandibular nerve. A M. stapedius. Muscle that originates in a bony canal on the posterior wall of the tympanic cavity. Its tendon passes through an opening at the apex ofthe pyramid before inserting at the head of the stapes. By tilting the stapes, it exerts a dampening effect on sound vibrations reaching the inner ear. I: Nerve to stapedius from the facial nerve. B

Mucous membrane of tympanic cavity. Tunica mucosa cavitatis tympanicae. It consists of simple squamous and/or cuboidal epithelium and a delicate vascular-rich lamina propria. Posterior mallear fold. Plica mallearis posterior. Fold extending from the base of the handle of the malleus to the posterior, upper part of the tympanic ring. It contains the posterior portion of the chorda tympani. D Anterior mallear fold. Plica mallearis anterior. Fold extending from the base of the manubrium to the anterior, upper part ofthe tympanic ring. It contains the anterior segment of the chorda tympani, the anterior process of the malleus and the anterior ligament of the malleus. D Fold of chorda tympani. Plica chordae tympani. Fold created by the chorda tympani on the neck of the malleus between the two above-mentioned folds. D 7 a Recess of tympanic membrane. Recessus membranae tympanicae. Mucosal pouch in the tympanic cavity.

Anterior recess of tympanic membrane. Recessus [membranae tympani] anterior. Mucosal pouch between the anterior mallear fold and the tympanic membrane. D

Superior recess of tympanic membrane (Prussak's pouch). Recessus [membranae tympani] superior. Recess bounded laterally by the flaccid part of the tympanic membrane, medially by the head and neck of the malleus and the body of the incus. D Posterior recess of tympanic membrane. Recessus [membranae tympani] posterior. Mu-cosal pouch between the posterior mallear fold and tympanic membrane. D Incudal fold. Plica incudialis. Mucosal fold extending from the roof of the epitympanic recess to the head of the incus or from the short limb of the incus to the posterior wall of the tympanic cavity. D

Stapedial fold. Plica stpedialis. Mucosal fold extending from the posterior wall of the tympanic cavity to the stapes. It covers the stapedius muscle and the stapes. B

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