Nerve Injury: Neuropraxia, Axonotmesis, Neurotmesis Flashcards
1
Q
Neuropraxia
A
Nerve intact => full recovery, autonomic function preserved
Electrical conduction affected
No Wallerian degeneration
2
Q
Axonotmesis
A
Myelin sheath intact
Connective tissue framework preserved
Axon damaged => Wallerian degeneration
3
Q
Neurotmesis
A
Axon, myelin sheath, connective tissue damaged => Wallerian degeneration
4
Q
Wallerian degeneration
A
Axonal degeneration distal to injury 24hrs post injury
-myelin sheath degenerates, phagocytosed by macrophages
5
Q
Nerve repair
A
Nerves must all be in direct contact
-if not, repair may not happen or a neuroma forms
Regrowth rate = 1mm/day
