HSCI 100 Lecture Notes - Lecture 14: Myelin, Saltatory Conduction, Leukodystrophy
20 Nov 2018
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Document Summary
The nervous system: allows for rapid communication between cells through sensory input, integration of that input and commanding output (ie. homeostasis, the more you use the stronger it becomes, 2 cell types: neurons and neuroglia. If not stimulated, it tends to atrophy and die. Efferent neurons - send info from the cns. Cell body - main part of cell where organelles an nuclei reside. Dendrite - many short extension that carry impulse to a cell body. Axon (nerve fibre) - single long extension that carries impulses away from cell body. Ganglion - cluster of nerve cell bodies within pns (peripheral ns). Nucleus - cluster of nerve cell bodies within cns. Saltatory conduction - jumping conduction, axon potential (electrical signal) jumps from node to node: conduction of nerve impulse from node to node, the rate is hundred of meter per second.
