<prompt> Which is the nerve root of Biceps jerk?C5-C6C6-C8C7-C8C8-T1  <response>: Ans. A C5-C6Ref: Grays Anatomy, 41st ed. pg. 792 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.Extra Mile Triceps jerk C6-8 The arm is supported at the wrist and flexed to a right angle. Triceps tendon is struck with a percussion hammer just proximal to the olecranon; this should elicit extension of the elbow. Radial jerk C7, 8 The radial jerk is a periosteal, not a tendon reflex. The elbow is flexed to a right angle and the forearm placed in the mid pronationsupination position. The radial styloid is struck with the percussion hammer. This elicits contraction of brachioradialis, which causes flexion of the elbow 