The main fiber {axon}| from soma is thin and smooth cylinder with neurofilaments. It is conductive. It has same-size branches at obtuse angles. It has bulbous endings and/or calyciform endings. It has small varicosities in chains. It has no ribosomes. It attracts specific dendrites.
Chemical flow in both directions supplies axon ends with molecules from cell body.
number
Most neurons have one axon. Retinal amacrine and olfactory granule cells have no axons. Dorsal root ganglion cells have multiple axons and no dendrites. Dorsal root ganglion cells have axon that bifurcates. Invertebrate cells often have one axon, with dendrites from it.
microtubule
Only axon hillock and initial segment have microtubule fascicles, have membrane undercoating, and have high sodium-channel density.
excitation or inhibition
Axon terminals are either all excitatory or all inhibitory.
regeneration
Axons can regenerate, if allowed by surrounding glial cells.
Biological Sciences>Zoology>Organ>Nerve>Neuron>Parts
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Date Modified: 2022.0224