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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.

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Presentation on theme: "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."— Presentation transcript:

1 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

2 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

3 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)

4 Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Reflexes Figure 13–15 Events in a Neural Reflex.

5 Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Spinal Reflexes Figure 13–17 A Stretch Reflex.

6 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

7 Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Spinal Reflexes Figure 13–19 A Flexor Reflex.

8 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

9 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

10 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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