- Missouri State University
- Biomedical Science
- Biomedical Science 308
Last Modified: 2012-05-15
- Oligodendrocytes – form myelin sheaths on CNS axons
- Schwann Cells - form myelin sheaths on PNS axons
- Astrocytes – contain processes covering capillaries in brain contributing to the blood-brain barrier
- Microglia – phagocytic amoeboid cells within CNS
- Ependyma – form epithelial lining for many CNS structures
- Define the following; nerve fiber, nerve, ganglion, nucleus, tract.
- Nerve fiber – (axon) a long process that conducts action potentials toward synapse
- Nerve – cable-like collection of nerve fibers
- Nucleus – collection of cell bodies located in the CNS
- Ganglion – collection of cell bodies located outside the CNS
- Tract – collection of nerve fibers connecting regions of the CNS
ix = gx (Vm – Ex)
- ix = ion x current
- gx = ion x conductance
- Vm = membrane potential
- Ex = equilibrium potential for ion x
- Caused by inward Na+ movement through voltage-gated channels
- Caused by outward K+ movement through voltage-gated channels
- Voltage-gated K+ channels have only a single gate that opens more slowly than Na+ channels during depolarization
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