COGS 107B - Winter 2010 - Lecture 2 - proprioception and the vestibular system

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COGS 107B - Winter 2010 - Lecture 2 - proprioception and the vestibular system

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  • Spinal nerve containing afferent DRG, ventral root, dorsal root, dorsal horn, ventral horn, grey matter, white matter, intermediate zone
  • COGS 107B - Winter 2010 - Lecture 2 - proprioception and the vestibular system

    1. 1. Cogs 107b – Systems Neuroscience www.dnitz.com lec01072010 – proprioception and the vestibular system the weekly principle(s): ‘the neuron doctrine’ and ‘law of dynamic polarization’ 1
    2. 2. sensory organ receptors: across different sensory modalities, anatomical features of sensory organ receptors determine the dynamics of their electrical activity and, within a modality, the type of sensory information they convey
    3. 3. proprioception and touch sense: the ‘all-axon’ ganglion cell
    4. 4. a simple proprioceptive circuit / system – the knee-jerk reflex
    5. 5. the muscle spindle: activation by muscle elongation / stretch is modulated by contraction state of the muscle
    6. 6. the Golgi tendon organ: registering tendon stretch (= muscle contraction)
    7. 7. functions of proprioception: - joint-protecting reflexes (e.g., knee-jerk) - adjustment of muscle contraction / recruitment - kinesthesia: detection of body position and movement - coordination of motor commands - sense of self?
    8. 8. dorsal root ganglion pathways to the brain
    9. 9. somatosensory cortex: integration of proprioceptive and tactile information
    10. 10. the Pinnochio effect the Pinocchio effect
    11. 11. functions of the vestibular system: - postural reflexes - gaze adjustment - assessment of self motion - a reason not to drink too heavily?
    12. 12. the ‘hair cell’ receptor – transduction of both head motion (vestibular system) and sound waves (auditory system) into neural signals
    13. 13. the ‘hair cell’ receptor – transduction of both head motion and sound
    14. 14. the inner ear
    15. 15. orthogonal orientation of the semicircular canals and otolith organs
    16. 16. semicircular canals: hair cell registration of rotational velocity, orthogonality, and the L/R push-pull system
    17. 17. registration of linear translation and static head position via the otolith organs, the utricle and saccule registration of rotational velocity of the head (about the trunk) via the semicircular canals
    18. 18. utricle and saccule: registration of static head position (relative to ground / gravity), orthogonality, and the hair cell population code
    19. 20. vestibular afferents: pathway to the brain and spinal cord
    20. 21. integrating vestibular signals I – the vestibulo-ocular reflex – adjusting and maintaining gaze during head movements
    21. 22. integrating vestibular signals II – the ubiquitous ‘head-direction’ neuron

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