Axon refers to a long, thin part of a neuron attached to the soma; divides into a few or many branches, ending in terminal buttons.
Other /More definition:
Axon refers to a single thin nerve fiber of constant diameter that extends from a neuron; the part of the neuron through which intraneuronal conduction occurs (via the action potential) and at the terminus of which is located the terminal buttons that release neurotransmitters. Moreover, it refers to a long, thin, cyclindrical tube-like structure which is part of a neuron that transmits impulses to other neurons through small branching structures called axon terminals.It is the part of the neuron that conducts nerve impulses over distances. Axon is also called the Nerve fiber.

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