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a sudden contraction of the triceps muscle caused by a smart tap on its tendon when the forearm hangs loosely at a right angle with the arm.
biceps reflexA reflex contraction of the biceps brachii used to assess the C5 and C6 reflex arcs.
With the arm gently flexed at the elbow, tap the biceps tendon with a reflex hammer; the tendon can be located with the thumb.
Damage to the musculocutaneous nerve, C5/6 at the root or above in the spinal cord.