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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.

The following is a more accessble plain text extract of the PDF sample above, taken from our Neurology Notes. Due to the challenges of extracting text from PDFs, it will have odd formatting:

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)
? 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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