Traumatic injury of a nerve causing paresthesia is:

 # Traumatic injury of a nerve causing paresthesia is:

A. Neuropraxia

B. Neurotmesis

C. Axonotmesis

D. Toxolysis

The correct answer is A. Neuropraxia.

Explanation:

• Neuropraxia is the mildest form of traumatic nerve injury, involving a temporary conduction block due to compression or mild trauma. It often causes paresthesia (tingling or numbness) without significant structural damage to the nerve. Recovery is usually complete within days to weeks.
• Neurotmesis is the most severe nerve injury, involving complete nerve transection with disruption of the nerve and its sheath, leading to permanent loss of function unless surgically repaired. Paresthesia may occur, but it’s not the primary feature.
• Axonotmesis involves damage to the axons but preservation of the nerve’s connective tissue. It causes more severe symptoms than neuropraxia, with longer recovery times (weeks to months), and paresthesia may be present but is less characteristic.
• Toxolysis is not a standard term in nerve injury classification and is incorrect in this context.

Since the question specifies a traumatic nerve injury causing paresthesia (a sensory symptom like tingling), neuropraxia is the most fitting answer due to its association with mild, reversible sensory disturbances.