Axon: Caliber
Other Neuromuscular
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Overview
From WUSTL NeuromuscularAxon diameter: Related to Neurofilament content Amount: More neurofilaments in larger axons Degree of phosphorylation Decreased phosphorylation: Neurofilaments more densely packed Increased phosphorylation: Side arms spread; Neurofilaments more widely spaced Myelination: Effects on neurofilaments Axons narrower in regions without myelin: Initial segment; Node of Ranvier Unmyelinated axons have more densely packed neurofilaments Size principles Large motor neuron Large axon Myelin: Thick; Long internodes Fast conduction velocity High threshhold to depolarization Type II muscle fibers innervated
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Shared genesExternal Resources
Data sourced from the Washington University Neuromuscular Disease Center. For clinical use, always refer to primary sources.