<prompt> What is the root value of Biceps jerkC5-C6C6-C7C7-C8C8-T1  <response>: Biceps jerk C5, 6 Triceps jerk C6-8 Radial jerk C7, 8 Biceps jerk C5, 6 - The elbow is flexed to a right angle and slightly pronated. A finger is placed on the biceps tendon and struck with a percussion hammer; this should elicit flexion and slight supination of the forearm. 