UMass Amherst KIN 460 - 12- Vestibular system (25 pages)

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12- Vestibular system



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12- Vestibular system

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Pages:
25
School:
University of Massachusetts Amherst
Course:
Kin 460 - Motor Control

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Kinesthetic Organs Overview What is the function of the vestibular system How is motion detected in the vestibular system How does the vestibulo ocular reflex work The vestibular system 3 semicircular canals anterior posterior horizontal 2 otoliths utricle and saccule Vestibular System in 2 minutes https youtu be P3aYqxGesqs Vestibular apparatus Semicircular canals Angular accelerations Otolith organs utricle and saccule Linear accelerations Static head position Box 14A A Primer on Vestibular Navigation Overview What is the function of the vestibular system How is motion detected in the vestibular system How does the vestibulo ocular reflex work Sensory receptors of the vestibular system Sensory receptors hair cells located in the ampullae utricle and saccule Part 1 Cross section of hair cells with kinocilia of a group of hair cells located on the same side of the hair cell Top view of hair cells Stereocilia move toward kinocilium depolarization neurotransmitter release excitation of vestibular nerve Morphological polarization of hair cells in the utricular and saccular maculae Response from a otolith afferent fiber in a monkey seated in a tilting chair Prior tilt high firing rate above zero firing rate increases or decreases depending on the direction of tilt Firing rate remains constant as long as tilting force remains constant encoding static forces applied to the head Forces acting on the head displace the otolithic membrane of the utricular macula Schematic representation of the action of otolith at rest left when the head is tilted centre and during linear acceleration right The action of otolith is similar both during tilting of the head and during linear acceleration Orientation of the utricular and saccular maculae in the head Arrows orientation of kinocilia Range of orientations signal linear forces in every direction the head might move Utricle and saccule Utricle Oriented horizontally responds to lateral displacement of the head Saccule Oriented



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