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Neuroscience - CLA
NSCI 1051

CH14BRAINCONTROLANDMOVEMENTLateral pathwaysCortical control of voluntary movement of distal musculature Control fine movements of the arms and fingers Corticospinalpyramidal tract and rubrospinal tract Lesions in lateral pathways cause inability to make fractionated movements of the arms and hands cant move parts independently voluntary movements are slower and less accurate Strokes damage these tracts cause paralysis on contralateral sideRecovery of voluntary movements over time except fractionated movements of fingersRubrospinal can compensate for corticospinal lesion lesion of rubrospinal reverses recovery Ventromedial pathwaysBrain stem control of posture of head and neckAxial and proximal musculatureKeeps head balanced as body navigates through space Turn the head in response to new sensory stimuliLocomotion Do not dwell to much on this material in yellow highlight just know what the tract does and what it connectsVestibulospinal tractOriginate in the vestibular nuclei of the medulla which relay information from the vestibular labyrinth in the inner earOne part of this tract projects bilaterally down the spinal cord to activate the cervical spinal circuits that control neckback muscles guide head movementAnother part projects ipsilaterally down to the lumbar spinal cord to maintain an upright and balanced posture by facilitating extensor motor neurons of the legs Influences proximal muscles important for maintaining balance and posture Head balance Tectospinal tractOriginates in the superior colliculus of the midbrain which receives direct input from the retina as well as visual cortex somatosensory and auditory information Orients response that directs the head and eyes to move so that the appropriate point in space is imaged on the fovea Head turns in response to new sensory stimuli Head response Pontine Recticulospinal tractEnhances the antigravity reflexes of the spinal cord The activity of ventral horn neurons maintain muscle length and tension
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