The lower arm is the section of the arm that extends from the elbow to the wrist. It consists of two long bones: the radius, which is located on the thumb side, and the ulna, which is on the opposite side. This part of the arm is crucial for various movements, including rotation and flexion, allowing for a wide range of activities. Muscles in the lower arm, such as the biceps and triceps, work together to enable actions like lifting and gripping. The lower arm also contains tendons and ligaments that connect muscles to bones and provide stability to the wrist and hand.