ear, middle defined in 1951 yearear, middle - ear, middle (tympanic cavity);
ear, middle - Cavity between ear-drum and auditory capsule, present in tetrapod vertebrates (not Urodela, Apoda, Snakes). Derived from a gill pouch (spiracle). Communicates with mouth by eustachian tube and is filled with air. Crossed by ear ossicles. Encased in bony projection of skull (bulla) in most mammals.
near ear, middle in Knolik
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