Neuropraxia
Mild degree blockage
Local conduction block
No wallerian degeneration
Reversible
Axon isn't disrupted
No muscle waste
Decrease(loss) of strength
Absence of tendon reflex (below the level of lesion)
Slightly sensory loss
No sympathetic change
Class l.......
Recovery weeks to months

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Axonotmesis
Second degree
The axon only disrupted
Loss of nerve conduction
Wallerian degeneration occurs
Arreflxia occurs
Axon degeneration occurs at rate 1-8 mm/day
Occurs due to (profound nature compression, traction, prolonged friction, percussion injury,closed crush, injection and operation)
Class ll
Recovery may occur

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Neurotmesis
Greatest degree
Complete disruption
Wallerian degeneration occurs
Regeneration may occur
Disruption of axon
Paralysis of denervated muscle
Loss of nerve conduction
Sensory disruption
Vasomotor disruption
May occur due to (stap would,high velocity projectiles and nerve traction disrupting the connective tissue of the nerve with complete transaction of nerve trunk)
Class lll
Regeneration may occur