内耳 inner ea 骨迷路 endolymph . superor semicircular canal boni perilymph labyrinth superior horizontal semicircular duct membranous semicircular labyrinth canal vestibule horizontal cochlea semicircular duct posterior 膜迷路 semicircular canal ampullae posterior semicircular duct round window oval window cochlear duct @1997 Encyclopaedia Brit annica, Inc内耳inner ear 骨迷路 膜迷路