What are the spinal cord segments responsible for the triceps jerk (elbow extension) reflex?

• A C5, C6
• B C6, C7
• C C8, T1
• D C7, C8 ✓

Explanation

The triceps reflex is mediated through D7 and D8 via the radial nerve. For comparison, the biceps and brachioradialis jerks are D5 and D6, and the finger flexor jerk is D8 and T1. In Indian exam convention the accepted answer is written as D7, D8, with D7 being the dominant segment. A radial nerve lesion abolishes this reflex while leaving the biceps jerk intact.

Reference: Ganong's Review of Medical Physiology, 26th ed.

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