Nervous System I

Nervous System I PowerPoint PPT Presentation

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The nerve of some people!. Master control and communication systemthree overlapping functionsgathering sensory inputprocessing stimuli (integration)responding to sensory input (motor output). Organization. Nervous systemperipheral vs. centralmotor vs. sensory (efferent vs. afferent)autonomic vs. somaticsympathetic vs. parasympathetic.

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Nervous System I

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1. Nervous System I April 19, 2007 BIOL 203 Karen Kraus

3. Organization Nervous system peripheral vs. central motor vs. sensory (efferent vs. afferent) autonomic vs. somatic sympathetic vs. parasympathetic

4. Supporting Services Nervous tissue : neurons and neuroglia six types of glial cells astrocytes microglia ependymal oligodendrocytes Schwann cells Satellite cells

5. The stars above... Astrocytes most numerous support and scaffold exchanges between blood and neurons guiding neuronal migration taking up excess potassium

6. Wrapping garments Ependymal cells often ciliated line ventricles and CSF cavities help to make and circulate CSF

7. Pruned Oligodendrocytes CNS myelination

8. Little guys Microglial cells nurses of the CNS phagocytic cells

9. Mooning Satellite cells unknown function

10. Ugly duckling Schwann cells neurolemmocytes PNS myelination axonal regeneration

11. Das Neuron! Ability to conduct nerve impulses extreme longevity amitotic (generally) high metabolic rate, with requisite high oxygen and glucose needs

12. Structure of a Neuron Cell body perikaryon soma Dendrites receptive region Axon conducting region

13. More structure

14. Husk of what it once was... Neurilemma vs. myelin sheath

15. A difference of opinion Nucleus a group of CNS cell bodies also called basal nucleus or basal ganglion Ganglion a group of PNS cell bodies

16. More differences Tract a group of CNS axons/dendrites (nerve fibers) Nerve a group of PNS axons/dendrites (nerve fibers)

17. A little class act Structural vs. functional structure number of extensions unipolar, bipolar, multipolar function direction of impulses afferent, efferent, inter

18. Need some structure... Structure of a typical nerve epineurium perineurium endoneurium fascicle spinal vs. cranial

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