Neuron - Neuron under myelin sheath there are no voltage...

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Neuron under myelin sheath there are no voltage gated Na channels neurilemma (sheath of Schwann): satellite cells provide support, cushioning it, insulator-satellite like Schwann cells don’t form myelin sheath neuroglial cells in CNS 4 types: 1) oligodendrocyte can contribute to forming myelin sheath in 100’s of diff. neurons (don’t create neurillemma) 2)apppendynal cells line fluid filled cavities w.i. brain or spinal and simple cuboidal or columnar 3) astrocytes act as a supporting framework, help transport nutrients to capillaries and axons, important in formation of blood brain barrier astrocytes: protoplasmic (in grey matter) thicker highly branching fibrous (in white matter) thinner don’t branch 80% of brain tumors are due to uncontrollable growth of fibrous astrocytes only thing that can cross blood brain barrier is lipid soluble gas alcohol gen. anasethetics (everything else is tightly regulated) hypertonic agitant will help a drug go across the brain barrier, will cause cells to shrink lots of aquaporins located in feet astrocytes like to take up K+ in interstitial fluid which will hyperpolarize cells will ensure an action potential microglial cells provide immune fxn in CNS (white blood cells usually do this but they don’t’ get past blood brain barrier) cytolysis or transform into a cell similar to monocyte (2 ways to do
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Neuron - Neuron under myelin sheath there are no voltage...

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