myelin sheath
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myelin sheath
formed by schwann cells in the pns
plasma membrane
forms layers around the axon
myelin sheath
function is to protect the neuron, provide insulation, and increase the speed of impulse transmision
nodes of ranvier
gaps in the sheath are spaces between cells
bigger the nerve, thicker the sheath
myelin sheath
formed by oligodendrocytes in the cns
myelin sheath
white covering of the axons (dendrites are unmyelinated)
myelin sheath
white matter in the brain is formed here
myelin sheath
axon can send out branches from this point
nodes of ranvier
crucial to increasing the speed of impulse transmission- imulse "jumps" from node to node
nodes of ranvier
farther apart
nodes of ranvier
form part of the sheath for up to 60 axons
one oligodendrocyte (od)
