The upper arm is the section of the arm located between the shoulder and the elbow. It contains the humerus, which is the long bone that runs from the shoulder joint to the elbow joint. The upper arm is primarily responsible for the movement of the arm and is involved in various activities such as lifting, pushing, and pulling. Muscles in the upper arm include the biceps brachii and the triceps brachii. The biceps are located at the front of the upper arm and help in bending the elbow, while the triceps are at the back and assist in straightening the arm. Together, these muscles enable a wide range of arm movements.