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A diagram showing the growing tegmen tympani, especially its inferior process. Panels A, B, C and D correspond to 11 weeks (Fig. 2), 12 weeks (Fig. 4), 13 weeks (Fig. 5) and 25 weeks (Fig. 7) of gestation, respectively. The inferior process of the tegmen tympani (arrows) approaches the tympanic bone to form the final petrotympanic fissure. OC, otic capsule; SQ, squamous part of the temporal bone; TE, tegmen tympani of the petrous part of the temporal bone; TY, tympanic bone.
