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| 90% of the CNS is composed of? |
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| protects CNS from foreign matter through phagocytes. Also it protects CNS from oxidative stress |
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| Glial Cell: Oligodendrocytes |
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| Glial Cell: Schwann Cells |
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| development of neutral connection, modulate synaptic activities, and removes neurotransmitters from synaptic cleft. |
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| Communicate to neurons through chemical messengers, maintain normal electrolyte composition of ICF, and protects neurons aganist toxic substances/oxidative stress |
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| secreted by ependymal cells of the choroid plexus which circulates to subarachnoid space and ventricle; reasorbed by arachnoid villi |
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1) Cushions Brain
2) Maintain interstitial fluid environment
3) total volume 125-50mL(recycled 3times day) |
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1)CNS comprises 2% of body weight
2)High metabolic rate
3)Depends on blood flow for energy |
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| Caused by decreased blood supply |
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| Blood-Brain Barrier: Capillaries |
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| Sites of exchange between blood and interstitial fluid |
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| Special anatomy of CNS capillaries which limits exchange |
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| White Matter: Projection Fiber |
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| Cerebral cortex with lower levels of brain or spinal cord |
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| White Matter: Association Fiber |
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| connect to areas of cerebral cortex on same side of brain |
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| White Matter: Commissural fibers |
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| Connects same cortical region on two sides of the brain |
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| White Matter: Corpus Callosum |
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| primary location of commissural fibers |
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| Sensory region of skin, each served by spinal nerves |
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| Gray Matter: functional halves |
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Dorsal: sensory functions
Ventral: motor functions |
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| tracts-ascending and decending |
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1)Bilaterally symmetrical
2)Cortex and nuclei |
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1)Motor coordination and balance
2)Coordination of eye and body movement |
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| contain both afferent and efferent axon |
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| transmit info from spinal cord to brain |
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| transmit info from brain to spinal cord |
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| when a pathway crosses to the side opposite its origin |
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| Automatic patterned response to a stimulus |
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