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electrical signal oligodendrocytes myelin spinal cord The central nervous system (CNS) is composed of the brain in the skull and the spinal cord in the vertebral column. The peripheral nervous systen (PNS) consists of the nerves that connect the CNS with the bodys muscles, glands, and sense organs The basic unit of the nervous system is the individual nerve cell, or neuron nodes of Ranvier In most neurons, generation of alan electrical signal causes the release of neurotransmitters which communicate with other cells muscles Action potential propagation occurs rapidy in the axons of neurons covered by myelin Schwann cells neurotransmitters in the CNS the oligodendrocytes form myelin sheaths around mutiple axons peripheral nervous system PNS In the PNS cells called chwanncels form individual myelin sheaths at reular In the PNS cells called Schwann ceils form individua I myelin sheaths at regular CNS intervais along the axons The spaces between adjacent sections of myein where the axons plasma membrane is exoosed to the e tracelular fuid are the nodes of Ranvie netiron

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