Which nerve injury has the worst prognosis and typically requires surgical repair?

Prepare for the Tissue Injury, Healing, and Pain Test. Utilize flashcards and multiple-choice questions with hints and explanations. Ensure you're ready for the exam!

Nerve injury severity and prognosis guide whether surgical repair is needed. If the nerve’s axon is intact with only myelin damage, recovery is rapid and complete without surgery (neurapraxia). If the axon is damaged but the surrounding connective tissue sheaths stay intact, axonotmesis occurs; regeneration can proceed along the preserved pathways, so recovery is possible but slower and may be incomplete. If the nerve is completely severed with disruption of the axon and its supportive structures, neurotmesis, there is no natural pathway for regrowing fibers, so spontaneous recovery is unlikely and surgical repair is required to restore continuity. This complete transection has the poorest prognosis among these injuries, hence the need for surgical repair to have any realistic chance of functional recovery.