BIO335 Lab 8 Class Notes

BIO335 Lab 8 Class Notes - THE MOTOR SYSTEM: A TEAM EFFORT!...

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THE MOTOR SYSTEM: A TEAM EFFORT!! Basal Ganglia : (LAST) Hypokinetic disorder Parkinson’s disease Hyperkinetic disorder Hemiballismus Huntington’s chorea Pyramidal motor system : (1) Loss of voluntary control Paresis, paralysis, weakness Spastic paralysis Spinal reflexes, motor units: (2) Lower motor neuron disorder Flaccid paralysis Cerebellum : (3) Intention tremor Dysmetria
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scending motor control parate pathways for Distal muscles, e.g, hands Proximal limb muscles Trunk muscles Facial muscles sturing Syndromes: corticate rigidity xed arms, hed back ended legs cerebrate rigidity ended arms hed back ended legs
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Why rigidity? Spinal reflexes: When muscles are stretched… When muscles are contacted… When you touch a hot stove…
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CEREBELLUM: The Executive Assistant! When the Conscious has to substitute for the Unconscious : Cerebellar ataxia Sailor’s gait Intension tremor Dysmetria Disdiadocokinesis
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Left arm: Right cerebral cortex Left cerebellum Right arm: Left cerebral cortex
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BIO335 Lab 8 Class Notes - THE MOTOR SYSTEM: A TEAM EFFORT!...

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