Motor 2-reflexes

Motor 2-reflexes - Click to edit Master subtitle style...

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Unformatted text preview: Click to edit Master subtitle style Reflexes and Descending Control of Reflexes reading B & L, Chapter 9 pp. 158-174 SPINAL REFLEXES What can the spinal cord alone do? Spinal cord does more than carry messages to and from the brain Spinal transection: lose sensation and voluntary movement below the cut Spinal reflexes remain definition: unlearned motor response to sensory stimulus NOT as used in common speech components of spinal reflexes: Muscles Motoneurons Sensory input from body Spinal interneurons many, many spinal reflexes, discuss only a few STRETCH REFLEX stimulus: stretch of a muscle response: contraction of the same muscle clinically tested by tendon tap which stretches muscle stretch reflex works to keep constant muscle length CIRCUIT Afferent (sensory input): IA fiber from muscle spindle Efferent: alpha () mn to same muscle very short latency reflex underlies MUSCLE TONE, resistance to passive stretch of a muscle (again technical definition of term not as used in common speech) drg ventral horn S...
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This note was uploaded on 02/22/2011 for the course PGY 451 taught by Professor Baizer during the Spring '09 term at SUNY Buffalo.

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Motor 2-reflexes - Click to edit Master subtitle style...

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