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18 Cards in this Set
- Front
- Back
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Astrocytes |
Are the largest most numerous glial cells
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5 functions of Astrocytes |
1. Control interstitial environment 2. Maintains BBB 3. Creates 3D framework 4. Repairs damaged neural tissue 5. Guides neuronal development
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Exteroreceptors |
External enviroment
- pressure, touch, temp - taste, hear, smell |
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Propreoceptos |
Postion and movement of muscles and joints |
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Interoreceptors |
Internal
- digestive, respiratory, cardiovascular - deep pressure and pain |
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Wallerian Degeneration |
- degeneration of myelin sheath and axon distal - axon deteriorates - macrophage phagocytize debris - schwann cells form cord around axon |
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Internode |
large myelinated area |
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Node of Ranvier |
Myelin sheath gaps |
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Divergence |
Info spreads from one to multiple |
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Serial Processing |
Sensory info relayed affect from one to another in brain |
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Parallel Processing |
Reflexes, processing info at the same time |
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Reverberation |
Allows for neurons to remain active when stimulated unless voluntarily inhibited or fatigue
- breathing |
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Aging |
- reduction in weight and size -reduction in neurons - decreased blood flow to brain - change in synaptic organization of brain - cellular changes in CNS |
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Changes in Aged |
Cerebral cortex reduces in volume
- reduces arterial flow which increases risk of stroke - artheroscelerosis (hardening of arteries)
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Changes in Aged |
Reduction in the number of neurons, also reduction of brain size
- number of dendrites and interconnections decrease |
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Changes in Aged |
intracellular and extracellular changes in neurons
- neurons in brain develop abnormal deposits - plaques form extracellularly
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Sympathetic Stimulation |
Can change activity of organ or tissue by releasing catecholamines into blood stream
- controlled by sympathetic centers in hypothalamus |
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When Sympathetic stimulation occurs |
increased alertness increased bp, hr, respiratory rate/ depth increased muscle tone increased in breakdown of glycogen |
