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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings C h a p t e r 13 The Spinal Cord, Spinal Nerves, and Spinal Reflexes PowerPoint® Lecture Slides prepared by Jason LaPres Lone Star College - North Harris Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Reflexes Automatic responses coordinated within spinal cord Through interconnected sensory neurons, motor neurons, and interneurons Produce simple and complex reflexes
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Reflexes Neural Reflexes Rapid, automatic responses to specific stimuli Basic building blocks of neural function One neural reflex produces one motor response Reflex arc The wiring of a single reflex Beginning at receptor Ending at peripheral effector Generally opposes original stimulus (negative feedback)
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Reflexes Figure 13–15 Events in a Neural Reflex.
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Spinal Reflexes Figure 13–17 A Stretch Reflex.
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Spinal Reflexes The Tendon Reflex Prevents skeletal muscles from Developing too much tension Tearing or breaking tendons Sensory receptors unlike muscle spindles or proprioceptors
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Spinal Reflexes Figure 13–19 A Flexor Reflex.
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings The Brain Can Alter Spinal Reflexes Integration and Control of Spinal Reflexes Reflex behaviors are automatic But processing centers in brain can facilitate or inhibit reflex motor patterns based in spinal cord
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings The Brain Can Alter Spinal Reflexes The Babinski Reflexes Normal in infants May indicate CNS damage in adults
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings The Brain Can Alter Spinal Reflexes Figure 13–21 The Babinski Reflexes.
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