Flexion:A movement that decreases the angle between two body parts; in this case, bending at the elbow.
Forearm: The region of the upper limb between the elbow and the wrist, containing two long bones (radius and ulna) along with several muscles including the brachioradialis.
Elbow Joint:A hinge type of joint made up of three bones—the humerus, radius, and ulna—that allows for bending and straightening of the arm