CNS - CENTRAL NERVOUS SYSTEM Brain and Spinal Cord Brain -...

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Unformatted text preview: CENTRAL NERVOUS SYSTEM Brain and Spinal Cord Brain - INTEGRATION! Muscle coordination Language Memory Emotions Thinking Learning Figure 9-9ab (1 of 5) Gray Matter Unmyelinated structures Dendrites Cell bodies Unmyelinated axons Cerebral cortex Nuclei White Matter Myelinated axons Tracts Table 9-1 Protection Bone Skull (cranium) Vertebrae (spinal cord) Meninges (3 layers) brain + spinal cord Dura mater Arachnoid mater Pia mater CSF (cerebrospinal fluid) physical + chemical Subarachnoid space Ventricles (2 laterals, 3 rd , cerebral aqueduct, 4 th ) Central canal of spinal cord Blood-Brain Barrier Selective permeability of capillaries in brain Figure 9-4 - Overview Figure 9-4b (1 of 2) CSF Production Secreted by choroid plexus (in walls of 3 rd and 4 th ventricles) Ependymal cells selectively transport ions + solutes from blood into ventricles (water follows) CSF Blood plasma (few proteins, no blood cells, different concentrations for various ions) Cilia help to circulate Fluid absorbed into blood at arachnoid villi Figure 9-5a, d Figure 9-5bc Blood-Brain Barrier Limited exchange between blood and interstitial fluid Tight junctions between endothelial cells Selected transport carriers/channels (water soluble substances) Lipid soluble substances easy diffusion (Some areas have more leaky capillaries example: posterior pituitary) Figure 9-6 - Overview Metabolism...
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This note was uploaded on 04/29/2009 for the course BIOL 425 taught by Professor Tondi during the Fall '08 term at George Mason.

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CNS - CENTRAL NERVOUS SYSTEM Brain and Spinal Cord Brain -...

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