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Inner surface of the right tympanic membrane with the malleus and incus attached to each other (Politzer)

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Legend: (a) short process of the incus; (pl) fold of the posterior pouch of the tympanic membrane; (ct) chorda tympani nerve; (h) head of the malleus; (n) niche in the outer wall of the tympanic cavity, in the squama. The fold of the anterior pouch of the membrane lies in front of the neck of the malleus, concealing the upper anterior attachment of the membrane and carrying the chorda tympani nerve to the anterior osseous wall and to the Glaserian fissure. (Source: Burnett CH, Ingals EF, Newcomb JE. A Text-Book on Diseases of the Ear, Nose, and Throat. Philadelphia and London: JB Lippincott Company, 1901.)