Reflexe1 - sensory neurons enter& motor neurons exit...

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Reflexes: - somatic reflexes: lead to contraction of skeletal muscles - autonomic (visceral) reflexes: lead to responses from smooth muscle, cardiac Reflex arc: - sensory receptor : distal end of sensory neuron; responds to stimulus - sensory neuron : carries impulse from receptor to axon terminals in gray matter of spinal cord (or brain stem) - integration center : within CNS gray matter, signal travels across synapse or through interneuron, generating a response - motor neuron : response impulse is sent from sensory neuron or interneuron through motor neuron to effector - effector : muscle or gland that carries out response (reflex) - general reflex types : o monosynaptic reflex o polysynaptic reflex o ipsalateral reflex same side o contralateral reflex
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Unformatted text preview: : sensory neurons enter & motor neurons exit spinal cord on opposite sides- somatic spinal reflexes : o stretch reflex: causes contraction of skeletal muscle in response to muscle stretching sensory receptors are muscle spindles o tendon reflex : causes muscle relaxation in response to increasing muscle tension (to prevent tendons from tearing) sensory receptors are (Golgi) tendon organs o flexor (withdrawal) reflex : causes muscle contraction to move body region away from painful stimulus plantar flexion reflex : curling under of toes in response to stimulation of lateral outer margin of toe damage to descending motor pathways causes great toe extension (Babinski sign), although a normal response in infants o crossed extensor reflex : works with withdrawal reflex to maintain balance contraction of extensors on opposite side of body to compensate for withdrawal (contralateral reflex) page5...
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Reflexe1 - sensory neurons enter& motor neurons exit...

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