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Schematic drawing by one of the authors (HPW) of the left whole labyrinth of the pigeon. The arrow marked with an asterix points toward the utricular duct and the region of the valve. BP basilar papilla, CA crista in anterior ampulla, CL crista in lateral ampulla, CP crista in posterior ampulla, ES endolymphatic sac, ML macula of the lagena, MN macula neglecta, MS saccular macula, MU utricular macula
