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Measured shape of the TM of a chinchilla: (a) 3-Dimensional shape; (b) 2-Dimensional side view of the shape; and (c) 2-Dimensional top view of the shape; the outline of the entire tympanic ring is highlighted by a circle. The black outline shows the handle of the malleus (the manubrium). The umbo of the manubrium is at the apex of the TM cone.
