Question:
Neurapraxia is best described as:
Neurapraxia is best described as:
Show Hint
Mildest Seddon grade - axon intact, only conduction temporarily blocked.
Updated On: Jun 25, 2026
- Physiological conduction block with intact axon
- Endoneurium and axon cut
- Nerve sheath (perineurium) cut
- Complete transection of the whole nerve trunk
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Recall Seddon's classification of nerve injury, which has three grades - neurapraxia, axonotmesis and neurotmesis.
Step 2: Neurapraxia is the mildest injury. It is a physiological (functional) conduction block usually due to segmental demyelination. The axon remains in continuity and the connective tissue sheaths (endoneurium, perineurium, epineurium) are intact.
Step 3: Because the axon is not divided, there is no Wallerian degeneration. Recovery is complete and relatively rapid (days to weeks) once the demyelinated segment remyelinates. EMG shows no denervation/fibrillation.
Step 4: Why the others are wrong - "Endoneurium/axon cut" describes axonotmesis (axon and myelin disrupted, sheath preserved, Wallerian degeneration occurs). "Sheath cut" or complete transection describes neurotmesis, the most severe injury where the nerve including its sheaths is divided, requiring surgical repair.
Key fact: Neurapraxia = reversible physiological conduction block with an intact axon and no Wallerian degeneration.
Step 2: Neurapraxia is the mildest injury. It is a physiological (functional) conduction block usually due to segmental demyelination. The axon remains in continuity and the connective tissue sheaths (endoneurium, perineurium, epineurium) are intact.
Step 3: Because the axon is not divided, there is no Wallerian degeneration. Recovery is complete and relatively rapid (days to weeks) once the demyelinated segment remyelinates. EMG shows no denervation/fibrillation.
Step 4: Why the others are wrong - "Endoneurium/axon cut" describes axonotmesis (axon and myelin disrupted, sheath preserved, Wallerian degeneration occurs). "Sheath cut" or complete transection describes neurotmesis, the most severe injury where the nerve including its sheaths is divided, requiring surgical repair.
Key fact: Neurapraxia = reversible physiological conduction block with an intact axon and no Wallerian degeneration.
Was this answer helpful?
0
0
Top INI CET Orthopedics Questions
- Neuropraxia (the mildest grade of nerve injury) is best described as:
- A young adult sustains chest trauma with haemodynamic instability and bilateral femur and tibia fractures. Once the patient has been resuscitated and is haemodynamically stabilized, what is the most appropriate definitive management of the fractures?
(Figure: X-ray of the limb showing the long-bone fracture.) - A young adult presents with chest trauma, haemodynamic instability and fractures of bilateral femur and tibia. After the patient has been resuscitated and rendered haemodynamically stable, what is the most appropriate definitive management of the long-bone fractures?
- What is the most likely cause of unilateral genu varum (bow-leg deformity of one leg) in a patient with a history of a previous injury to that limb?
(Figure: AP X-ray of both lower limbs showing bowing of one leg.) - An athlete presents with sudden pain in the back of the ankle after a push-off, with weakness of plantarflexion. Imaging suggests Achilles tendon rupture. Which of the following is the relevant clinical finding/sign for this condition?
(Figure: Sagittal fat-saturated ankle MRI showing discontinuity of the Achilles tendon.)
Top INI CET Seddon classification of nerve injury – neuropraxia Questions
Top INI CET Questions
- Which of the following is the most common cause of acute pancreatitis?
- Which of the following conditions is most commonly associated with hypoparathyroidism?
- The drug of choice for treating acute gout flare is:
- Which of the following bacteria is the most common cause of community-acquired pneumonia?
- Which of the following is the hallmark of Type 1 Diabetes mellitus?
View More Questions