columella auris


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columella auris

a bony or cartiliginous rod which connects the ear drum to the inner ear in reptiles, birds and some amphibians. It is homologous with the STAPES of mammals and the HYOMANDIBULA of fishes.
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Entwicklung der Columella auris bei den Lacertiliern.
Photomicrograph (H&E) of a transverse section passing through the auditory region at 6.5 cm total body length, showing the dorsal portion of undifferentiated mesenchymatous rod shape columella auris (C.A) close to the auditory capsule (A.C).
Photomicrograph (H&E) of a transverse section passing through the auditory region at 6.5 cm total body length, showing freely ventral portion columella auris, mesenchymatous pterygoquadrate (P.Q), Meckel's cartilage primordium (M.C.PR) and basal plate (B.P).