GSU NEUR 3000 - NEUR 3000 - Chapter 14 (33 pages)

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NEUR 3000 - Chapter 14



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NEUR 3000 - Chapter 14

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Pages:
33
School:
Georgia State University
Course:
Neur 3000 - Hon Principles of Neuroscience

Unformatted text preview:

BRAIN CONTROL OF MOVEMENT NEUR 3000 Dr Joseph J Normandin THE HIERARCHY OF THE MOTOR SYSTEM Strategy the goal of the movement and the strategy to achieve that goal Non primary motor cortex and basal ganglia Tactics the sequence of muscle contractions in time and space to achieve the strategic goal Primary motor cortex and cerebellum Execution activation of the motor neurons and interneurons that generate movements and any posture adjustments needed Brain stem and spinal cord recall that the third source of input to alpha motor neurons we have not discussed are upper motor neurons of the hierarchical levels above DESCENDING SPINAL TRACTS Divided into two major groups Lateral pathways through the lateral columns of the spinal cord Voluntary movement of distal musculature Under direct cortical control Ventromedial pathways through the through the ventromedial columns of the spinal cord Posture and locomotion Distal and proximal muscles Reflexively maintained Under brainstem control DESCENDING SPINAL TRACTS The lateral pathways two tracts Corticospinal tract pyramidal tract Rubrospinal tract DESCENDING SPINAL TRACTS The lateral pathways two tracts Corticospinal tract pyramidal tract Rubrospinal tract Lesions of the lateral pathways in monkeys results in Paralysis of voluntary movement on the contralateral side Gradual recovery Permanent loss of voluntary movement of individual parts of the body Could not move shoulders arm hand etc independently Normal posture DESCENDING SPINAL TRACTS The ventromedial pathways four tracts Vestibulospinal tract Tectospinal tract DESCENDING SPINAL TRACTS The ventromedial pathways four tracts Vestibulospinal tract Vestibular nucleus receives information from the vestibular system Terminates at cervical motor neurons for the neck and back and lumbar motor neurons of legs Maintains head balance and body balance w vestibular input Tectospinal tract Superior colliculus receives information from the retina Terminates on motor neurons for eye



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