Motor Control (Supraspinal Mechanisms) Notes

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This is an extract of our Motor Control (Supraspinal Mechanisms) document, which we sell as part of our Neurology Notes collection written by the top tier of Bristol University students.

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Lecture 21 & 22 Motor Control: Supraspinal Mechanisms

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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
? BABINSKI SIGN

* 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)
? Spinal prep
? Flaccid paralysis
? Loss of both voluntary and muscle tone o Lesion dividing upper and lower brainstem (level of colliculi)
? Decerebrate prep
? Decerebrate rigidity
? Muscle stiffness due to release from upper brain stem control o Lesion dividing cerebrum from upper brainstem (level of upper reticular formation)
? Decorticate prep
? Spasticity-Exaggerated reflexes
? Release from cerebral control Organisational features of motor system

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