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MOTOR CONTROL - Coggle Diagram
MOTOR CONTROL
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CLINICAL FEATURES
tremor - at rest - 4-6hz, involves hand, leg, jaw
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usual onset age over 60, slowly progresses with age
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VENTROMEDIAL TRACT
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controls more general and bilateral movements - standing, walking, adjusting balance
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PRE MOTOR CORTEX
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an important role in orienting body, readying postural muscles for forthcoming movements
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KINAESTHETIC SENSATION
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muscle spindle, muscle length, eg stretch
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DAMAGE TO MUSCLES
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muscle weakness, not nerve damage
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SPINAL CORD
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posterior/ dorsal root - sensory information, ascending tracts
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RELFEX ACTIONS
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reflex - involuntary, automatic movements in response to specific stimuli
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WITHDRAWAL REFLEX
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the burst of firing in the sensory neurons excites excitatory spinal interneurons that excite biceps motor neurons
at the same time, the burst of firing in the sensory neurons excites inhibitory spinal interneurons that inhibit triceps motor neurons
The simultaneous contraction of the biceps muscle and relaxation of the triceps muscle causes a rapid flexion of the elbow joint
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BRAIN STEM
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main structures :
midbrain, pons, and medulla
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CEREBROCEREBELLAR
DEFICITS
rapid coordinated smooth movements - speaking, writing, clapping
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SPINOCEREBELLAR
DEFICITS
hard to control walking movements, shuffling, wide gait
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