Lecture 31 - Reflexes Definition Reflex: a rapid automatic...

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Reflexes
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Definition Reflex : a rapid automatic response to a stimulus Reflex arc : the “wiring” of a particular reflex Innate reflex : inborn Learned reflex : reflex acquired through experience
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Components of a reflex arc Sensory receptor Sensory neuron Integrating center – may or may not include an interneuron Motor neuron Effector
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Classification of reflexes Monosynaptic vs. polysynaptic Somatic vs. visceral Cranial vs. spinal Ipsilateral vs. contralateral
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Pathways of 4 reflex arcs 1) Stretch reflex 2) Tendon reflex 3) Flexor reflex 4) Crossed extensor reflex b All are somatic and spinal
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Stretch reflex • Purpose is to prevent injury from over- stretching a muscle • Results in contraction of the muscle that was stretched • Stretch sensed by muscle spindle • Monosynaptic, ipsilateral, spinal, somatic reflex
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Stretching stimulates SENSORY RECEPTOR (muscle spindle) EFFECTOR (same muscle) contracts and relieves the stretching MOTOR NEURON excited SENSORY NEURON excited To brain
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Lecture 31 - Reflexes Definition Reflex: a rapid automatic...

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