Lecture 9 Oct-4-11 Chapter 13 - Oct42011 Chapter13 TheSpinalCord,Nervesand Reflexes Bio2870A&P Oct42011 AnIntroduction Bio2870A&P 14 2 Oct

Lecture 9 Oct-4-11 Chapter 13 - Oct42011 Chapter13...

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Ch-13  Spinal  Cord and Reflexes Oct-4-2011 Bio 2870 A & P Introduction to Anatomy and Physiology Chapter  13  The Spinal Cord, Nerves and  Reflexes
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Ch-13  Spinal  Cord and Reflexes Oct-4-2011 Bio 2870 A & P 2 An Introduction Figure 13–1 An Overview of Chapters 13 and  14.
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Ch-13  Spinal  Cord and Reflexes Oct-4-2011 Bio 2870 A & P 3 Gray Matter and White Matter Sectional Anatomy of the Spinal Cord White matter Is superficial Contains myelinated and unmyelinated axons Gray matter Surrounds  central canal  of spinal cord Contains neuron cell bodies, neuroglia, unmyelinated axons  Has projections ( gray horns
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Ch-13  Spinal  Cord and Reflexes Oct-4-2011 Bio 2870 A & P 4 Gray Matter and White Matter Figure 13–5a The Sectional Organization of the Spinal Cord.
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Ch-13  Spinal  Cord and Reflexes Oct-4-2011 Bio 2870 A & P 5 Neuronal Pools Functional Organization of Neurons Sensory neurons About 10 million Deliver information to CNS Motor neurons About 1/2 million Deliver commands to peripheral effectors Interneurons About 20 billion Interpret, plan, and coordinate signals in and out
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Ch-13  Spinal  Cord and Reflexes Oct-4-2011 Bio 2870 A & P 6 Neuronal Pools Five Patterns of  Neural Circuits  in Neuronal Pools Divergence Spreads stimulation to many neurons or neuronal pools in  CNS Convergence Brings input from many sources to single neuron  Serial processing Moves information in single line Parallel processing Moves same information along several paths simultaneously Reverberation Positive feedback mechanism Functions until inhibited
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Ch-13  Spinal  Cord and Reflexes Oct-4-2011 Bio 2870 A & P 7 Neuronal Pools Figure 13–14 Neural Circuits: The Organization of Neuronal Pools.
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Ch-13  Spinal  Cord and Reflexes Oct-4-2011 Bio 2870 A & P 8 Reflexes Automatic responses coordinated within spinal cord  Through interconnected sensory neurons, motor neurons,  and interneurons Produce simple and complex 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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