<unk>  is an<unk>  to nervous tissue. There is no single classification system that can describe all the many variations of<unk> es. In 1941, Seddon introduced a classification of<unk> es based on three main types of nerve fiber<unk>  and whether there is continuity of the nerve. Usually, however, peripheral<unk> es are classified in five stages, based on the extent of damage to both the nerve and the surrounding connective tissue, since supporting glial cells may be involved. Unlike in the central nervous system, neuroregeneration in the peripheral nervous system is possible. The processes that occur in peripheral regeneration can be divided into the following major events: Wallerian degeneration, axon regeneration/growth, and reinnervation of nervous tissue. The events that occur in peripheral regeneration occur with respect to the axis of the<unk> . The proximal stump refers to the end of the<unk> d neuron that is still attached to the neuron cell body; it is the part that regenerates. The distal stump refers to the end of the<unk> d neuron that is still attached to the end of the axon; it is the part of the neuron that will degenerate, but the stump remains capable of regenerating its axons. The study of peripheral<unk>  began during the American Civil War and greatly expanded during modern medicine with such advances as use of growth-promoting molecules.
Nerve injury
Accessory nerve disorder
Neurocristopathy
Catastrophic injury
Enthesopathy
Neuromuscular disease
Nerve compression syndrome
Spinal disease