Lecture 9 Oct-4-11 Chapter 13

Lecture 9 Oct-4-11 Chapter 13 - Ch-13 Spinal Cord and...

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Unformatted text preview: Ch-13 Spinal Cord and ReflexesOct-4-2011Bio 2870 A & PIntroduction to Anatomy and PhysiologyChapter 13 The Spinal Cord, Nerves and ReflexesCh-13 Spinal Cord and ReflexesOct-4-2011Bio 2870 A & P2An IntroductionFigure 13–1 An Overview of Chapters 13 and 14.Ch-13 Spinal Cord and ReflexesOct-4-2011Bio 2870 A & P3Gray 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) Ch-13 Spinal Cord and ReflexesOct-4-2011Bio 2870 A & P4Gray Matter and White MatterFigure 13–5a The Sectional Organization of the Spinal Cord.Ch-13 Spinal Cord and ReflexesOct-4-2011Bio 2870 A & P5Neuronal 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 outCh-13 Spinal Cord and ReflexesOct-4-2011Bio 2870 A & P6Neuronal PoolsFive 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 inhibitedCh-13 Spinal Cord and ReflexesOct-4-2011Bio 2870 A & P7Neuronal PoolsFigure 13–14 Neural Circuits: The Organization of Neuronal Pools.Ch-13 Spinal Cord and ReflexesOct-4-2011Bio 2870 A & P8Reflexes•Automatic responses coordinated within spinal cord •Through interconnected sensory neurons, motor neurons, and interneurons•Produce simple and complex reflexesNeural ReflexesRapid, automatic responses to specific stimuliBasic building blocks of neural functionOne neural reflex produces one motor responseReflex arcThe wiring of a single reflexBeginning at receptorEnding at peripheral effectorGenerally opposes original stimulus (negative feedback)Ch-13 Spinal Cord and ReflexesOct-4-2011Bio 2870 A & P...
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This note was uploaded on 12/14/2011 for the course BIO 2870 taught by Professor Spranger during the Spring '08 term at Wayne State University.

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Lecture 9 Oct-4-11 Chapter 13 - Ch-13 Spinal Cord and...

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