Neuro 6

Question 1

Describe neuropraxia:

Answer 1

• least severe type of injury
• often caused by swelling
• no microscopic signs of injury
• generally gone within a few weeks

Question 2

Describe axonotmesis

Answer 2

• more severe type of injury
• generally the perineurium and the epineurium will be gone
• generally a compression injury
• the area that is distal to the injury is likely to die (Wallerien degeneration)
• regenerated but can leave a scare
• PNS regrowth at a rate of 1-4mm every day

Question 3

Describe neurotmesis:

Answer 3

• severance of entire nerve fibre
• continuity of connective tissue structures will be lost
• Most severe type
• Wallerian degeneration will occur distally
• In PNS, some regeneration but takes longer
• Regeneration may form neuromas