The Nervous System
The Nervous System
The Nervous System
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Structures Vital to Nerve Conduction• Myelin– White fatty material– Protects/insulates neuron– In the PNS• Axons myelinated by schwann cells• Each cell wraps around the axon like a jelly roll.– Neurilemma – “neuron husk”. External to themembrane– In the CNS• Oligodendrocytes myelinate nerve fiber– No neurilemma