Motor Control (Supraspinal Mechanisms) Notes
This is a sample of our (approximately) 4 page long Motor Control (Supraspinal Mechanisms) notes, which we sell as part of the Neurology Notes collection, a 70-80% package written at Bristol University in 2012 that contains (approximately) 117 pages of notes across 36 different documents.
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Motor Control (Supraspinal Mechanisms) Revision
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Lecture 21 & 22 Motor Control: Supraspinal Mechanisms
Motor system: three levels of control o CEREBRAL CORTEX
Direct projections from here to spinal cord
Parallel projections from brain stem o BRAINSTEM
CVS and respiratory control
Muscle control o SPINAL CORD
Able to function, even when disconnected from rest of brain
Own sophisticated neuronal control Organisation of motor system o Parallel
Because each level issues commands that act directly on lowest level
If one part of motor system is damaged other parts can compensate o HIERACHICAL
Motor system organised into series of functional levels
Higher levels provide commands for lower levels
Army picture in book Damage o Lower level damage: specific deficit
Defect is immediate
Limited, specific jobs not done
Localised legion and specific deficit o Higher level damage
At first, nothing may seem wrong
But long term planning lost
New planning as lower commanders released from higher centres
• Upper motor neuron lesion
• Toes fan out (in babies as descending pathway underdeveloped) Effects of transaction at different levels of CNS o Lesion dividing spinal cord from CNS (lower motor neuron legion- level of C1)
Loss of both voluntary and muscle tone o Lesion dividing upper and lower brainstem (level of colliculi)
Muscle stiffness due to release from upper brain stem control o Lesion dividing cerebrum from upper brainstem (level of upper reticular formation)
Release from cerebral control Organisational features of motor system
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