cupula, vestibular system organ. inner ear ampullary cupula providing

vestibular membranous macula cupula static cochlear equilibrium labyrinth canal balance organ hair inner system ear cochlea anatomical equilibrum ampullary ampulla vestibule crista tube dynamic human vector macule saccule elliptical external maculae otology cilia cell pilus round spiral duct enlarged recess anatomically providing sense spatial orientation healthy sensory head rotation stimulation