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30 knes 462 fk 08 vestibular system receptors i

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Unformatted text preview: on in 3D space • Vestibular labyrinth is filled with endolymph. 30 KNES 462 ©FK ‘08 Vestibular System: Receptors I • Otolith organs have specialized areas which contain hair cells: the hair macula mats--- flexion of the hair shoos off efferents. – utricular macula for horizontal linear acceleration – sacclular macula for vertical linear acceleration • Hairs embedded in gelatinous mass covered with little crystals 31 KNES 462 ©FK ‘08 KNES 462 ©FK ‘08 Vestibular System: The macula • Deflection of hair cells both during linear acceleration and static tilt, due to gravity & weight of the otoconia! • Hair cells on opposite sides of the striola have opposing polarizations (excitation / inhibition) • Otolith organs inform brain about the direction of gravity and horizontal ( ) and vertical ( ) acceleration. 32 2 KNES 462 Bi-directionality of otolith organ cells KNES 462 ©FK ‘08 KNES 462 33 ©FK ‘08 KNES 462 ©FK ‘08 Vestibular System: Receptors II • Semicircular ducts have also specialized areas which contain hair cells: the cupula, located in the ampulla – Hairs...
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