Wallerian degeneration occurs when a nerve fiber is crushed, frozen, or cut and degeneration of part of the axon distal (the part of the nerve that’s furthest away from the neuron’s cell body) begins.
Wallerian degeneration is an active process of degeneration that results when a nerve fiber is cut or crushed and the part of the axon distal to the injury (i.e. farther from the neuron's cell body) degenerates.
