Myelin Sheath
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What is the myelin sheath?
composed of myelin, a whitish, protein lipid substance
nonmyelinated fibers
do not contain sheath; conduct impulses more slowly
What are ion channels made for?
for opening and closing in order for action potentials to activate
What are the nodes of Ranvier?
gaps between myelin sheaths on axon
what is the function of myelin sheath?
protect and electrically insulate axon; increase speed of nerve impulse transmission
myelinated fibers
segmented sheath surrounds most long or large-diameter axons