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Physiology Nervous system Lecture

Physiology Nervous system Lecture - P215 Fall 2012 The...

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The Nervous System, Nerve Cells and Nerve Cell Signals General Role of Nervous System P215 Fall 2012 Stanfield and Germann: Chap 7, pp. 167-172, 179-191 Cells of the Nervous System homeostasis Organ Systems ne r vou s system musculoskeletal system respiratory system digestive system immune system renal system cardiovascular system endoc i ne system often described to “support neurons” glial cells 2) guide Stanfield: Chap 7, pp. 167-172, 179-191 (same pages) 1) protect general roles of the NS growth growing nerve cell “tube” of glial cells - (see figure 7.4) Basic Function and Structure of the Nervous System central nervous system peripheral nervous system sensory receptors muscles, glands
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nerve cells most important role of nerve cells number of glial cells, compared to neurons 3) produce 4) help regulate nerve cell structure helps them carry out major role axon glial cells (continued) plasma plasma BBB neurons with non-myelinated axons ce ll body ( CB ) dend r i te s (D) axon (A) n t a l segment (I S axon te m na (AT) neurons with myelinated axons one type of astrocyte astrocytes endothelial cells in walls of capillary blood flowing along capillary (see figures 7.2 and 7.3)
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look at the forces acting on Na + at resting potential look back and a look forward membrane potential becomes more negative
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Physiology Nervous system Lecture - P215 Fall 2012 The...

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