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12 Cards in this Set
- Front
- Back
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What are glial cells? |
Non-neural cells CNS and PNS |
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Glial cells in CNS? |
Oligodendrocytes Astrocytes Ependymal cells Microglia |
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Glial cells in PNS? |
Schwann cells Satellite cells |
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Oligodendrocytes Mainfunction? |
Support and insulation to axons in CNS Creates myelin sheaths One oligodendrocyte - 50 axons One oligodendrocyte, one section for several adjacent axons |
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Oligondendrocyte Injury |
Multiple sclerosis Leukodystrophy - degeneration of white brain matter |
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Astrocyte, function? |
Structural - physical structure of brain Glycogen fuel reserve buffer - glucogenesis Metabolic support - provide neurons with nutrients Glucose sensing - Transmitter uptake and release Regulation of ion concentration in extracellular space Modulation of synaptic transmission Vasomodultion - blood flow Promotes myelin activity Nervous system repair - glial scar
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Astrocyte subdivisions? |
Fibrous astrocyte Protoplasmic astrocyte |
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Ependyma, function? |
CNS Production of cerebrospinal fluid Neuroepithelial lining of ventricular system CNSProduction of cerebrospinal fluidReservoir of neuroregenerationLink to astrocytesCilia Reservoir of neuroregeneration
Link to astrocytes Cilia
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Fibrous astrocytes |
Prevalent among myelinated nervefibres in white matter of CNS Fibrils in cytoplasm Feet at capillaries! |
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Protoplasmic astrocytes |
Occur in gray matter of CNS |
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Microglia, function? |
Resident macrophage Active immune defense of CNS Unique K+ channel Highly adaptive |
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Blood-brain barrier |
BBB Semipermeable Formed by endothelial cells |
