APEA Neurology Practice Test

Abnormal right biceps reflex localizes to which cervical segments?

Lumbar 2, 3, and 4 Cervical 6 and 7 Cervical 5 and 6 Sacral 1

Correct Answer:

Cervical 5 and 6

Explanation:

The biceps reflex is mediated by the musculocutaneous nerve through spinal cord segments C5 and C6, so an abnormal reflex on the right points to dysfunction at those cervical roots. This is why the correct localization is C5-C6. The knee reflex involves lumbar segments L2-L4, the ankle reflex involves S1, and a focus on C6-C7 would not correspond to the primary innervation of the biceps reflex, making C5-C6 the best answer.

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