general organization of the motor systems. reflex arc neural “wiring” of reflex requires 5...
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General Organization of the Motor Systems
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Reflex arc •Neural “wiring” of reflex•Requires 5 functional components: 1. sensory receptor, 2. sensory neuron, 3. intergrating center (SC or BS), 4. motor neuron, & 5. effector
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curve A, in a normal muscle, and curve B, in a muscle whose muscle spindles were denervated
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Muscle Spindle Reflex
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Golgi Tendon Reflex
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withdrawal crossedextensor
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Myogram of the flexor reflex showing rapid onset of the reflex, an interval of fatigue, and,
finally, afterdischarge after the input stimulus is over.
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Myogram of a crossed extensor reflex showing slow onset
but prolonged afterdischarge
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Control of voluntary movement
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The somatosensory cortex homunculus & The motor cortex homunculus
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Inputs to motor cortex
SMAPremotor
cortex
Primarymotor cortex
Thalamus
Basalganglia
Cerebellum
Spinal/sensory inputs
Thalamus
Primarysensorycortex
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DECEREBRATIONand DECORTICATION
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Plantar Response
Scrape object on sole of foot.Babinski sign indicative of UMN lesion.
Normal in infants up to 1 yr.