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general functions of the vestibular system
1. contribute to sense of movement and balance
2. stabilize vision during head movement (VOR)
3. regulate postural tone
specific functions of vestibular system
transduction of angular/linear velocities & accelerations and transduction of the gravitational vector
normal vestibular function relies on the equivalent densities (or specific gravity) of ___ and ___
endolymph and cupula
cutaneous receptors that receive information regarding pressure
merkel's discs and pacinian corpuscle
golgi tendon organs : "GTO's"
sensitive to changes in muscle force/tension - activated when muscle is contracted (firing rate increases w/greater tension)
primary somatosensory cortex
proprioceptive and cutaneous information ascends in afferent tracts in spinal cord and projects to sensory and parietal cortex
amount of cortical tissue devoted to each body surface proportional to sensitivity of that part
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