Biceps and Triceps Reflexes
In the thoracic limb, the biceps and triceps reflexes often can be elicited in relaxed pets that are in lateral recumbency. The clinician should place a finger on and tap the distal ends of both biceps and brachialis muscles at the level of the elbow. A normal response is slight flexion of the elbow. The musculocutaneous nerve mediates the biceps reflex through spinal cord segments C6-C8. The triceps reflex is elicited by lightly tapping the tendon of insertion of the triceps muscle proximal to the olecranon. This causes slight extension of the elbow. The radial nerve mediates the triceps reflex through spinal cord segments C7-T2.