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CNS, ANS, Somatic, and Integrated Functions

Plexuscsf blood brain barrier oligodendrocytes in cns

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Unformatted text preview: nnections, regulate development and maintenance of synapses (can wrap around synapses), take up transmitter, can release other transmitters, electrolyte environment Microglia: protect the CNS from bacteria/cell debris, phagocytosis, and cytokine release, relieve oxidative stress Ependymal cells: line the brain ventricles and central canal, involved in choroid plexus/CSF (Blood brain barrier) Oligodendrocytes: in CNS only, form insulating wrap around neuronal axons Schwann cells: wrap around PNS neurons to create saltatory nerves of rainier Myelin Sheath: Cross- section Multiple Sclerosis: autoimmune attack of oligodendrocytes, reduces the ability for saltatory nervous transmission Alzheimer’s disease: overactive astrocytes and microglia, degeneration of cholinergic neurons Parkinson’s disease: glial cells overactive inflammatory agents Gray and White Matter 40% gray matter, and 60% white matter Gray matter is cell bodies, plus dendrites and axon terminals White matter: myelinated axon, and oligodendrocytes. Gray matter: composed of dendrites and axon terminals Most synaptic transmission occurs in gray matter Most external surface of brain is gray matter; also embedded nuclei White matter: composed mainly of myelinated axons; myelinate- fatty- white Projection fibers: cerebral cortex with lower levels of brain or spinal cord Association fibers: connect two areas of...
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