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17 Cards in this Set
- Front
- Back
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what are the 3 components of a neuron
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soma, dendrites, axon
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Ganglia
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bundles of cell bodies in the PNS
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Dendrites
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carry nerveimpulses towards body
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Axons
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Carry nerve impulses away from cell body
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Axon hillock what is the significance
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has the lowest thresh hold,
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Myelin and myelin sheath what is the node of ranvier
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lipid insulation and the sheath is the whole membrane, the intervals that seperate the myelin sheath
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Saltatory Conduction
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ions flow through the length of the myelin sheth increasing velocity
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Four types of neuron cell configuration, which is most common
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Unipolar,pseudounipolar , bipolar,multipolar- most common
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Sensory Neurons
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impulses from peripheral to CNS
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Associational Neurons
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Neuron to Neuron
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Motor Neurons
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From CNS to effector (muscles etc.)
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Neuroglia
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support element of the neuron
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Astrocytes
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fill spaces between neurons and blood vessles
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oligodendroglia
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deposit myelin
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Microglia
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eat debris
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What are the steps to wallerian degeneration
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1.swelling distal to cut 2.neufilament hypertrophy 3.myelin sheath shrinks and desentigrates 4. myelin sheath reforms into shwan cells
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Proximal end of axon injury
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sewlling and disspersing Nissle substance, increase metabolic activity, 7-14 new terminal sprouts
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