Nerve Injury And Repair

Question 1

What are the kinds of injury?

Answer 1

Neuropraxia
Axonotmesis
Neurotmesis

Question 2

Features of Neuropraxia

Answer 2

Endoneurium in tact
Axon intact
Mild compression\ demyelination
Mild conduction block
Mild muscle weakness
Mild sensory loss
Recovery is complete and spontaneous
Examples:
Crutch palsy
Saturday night palsy (falling asleep)

Question 3

Features of Axonotmesis

Answer 3

Endoneurium intact
Axon is damaged (not intact)
Mild demyelination (wallerian degeneration)
Medium motor and sensory loss
Moderate conduction block
Repair without surgery
Good recovery (usually complete function and usually spontaneous)
Example
Fracture (closed)
Severe dislocated

Question 4

Features of Neurotmesis

Answer 4

Endoneurium not intact
Axon not intact
Significant demyelination
Severe injury can damage other layers (peri and Epi)
Recovery is poor, surgery
Severe conduction block
Examples
Open fractures
Cut the nerve
Gun shot wound