13 and 14 PNS and Reflexes

13 and 14 PNS and Reflexes - The Peripheral Nervous System...

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The Peripheral Nervous System and Reflex Activity (ch 13)
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Reflexes A reflex is a rapid, predictable motor response to a stimulus Reflexes may: Be inborn (intrinsic) or learned (acquired) Involve the spinal cord or higher brain centers as well May be somatic or autonomic
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Reflex Arc 1. Receptor – site of stimulus 2. Sensory neuron transmits the afferent impulse to the CNS 3. Integration center – either monosynaptic or polysynaptic region within the CNS 4. Motor neuron – conducts efferent impulses from the integration center to an effector 5. Effector – muscle fiber or gland that responds to the efferent impulse
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Stretch Reflexes Patellar (Knee jerk) L2-L4 Biceps (Arm jerk) C5-C7 Achilles reflex S1-S2
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Superficial Reflexes Plantar reflex - Stimulation of skin receptors - Uses both cord level and upper motor pathways (Tests proper coricospinal functioning which carriess impulses to primary motor cortex
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Autonomic Reflex Sympathetic and Parasympathetic
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This note was uploaded on 02/26/2011 for the course BIO 107 taught by Professor Smith during the Spring '11 term at NE Texas CC.

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13 and 14 PNS and Reflexes - The Peripheral Nervous System...

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