Anatomy of the elbow

The elbow is a complex joint where the upper arm bone (humerus) connects with two forearm bones—the radius and ulna. It allows bending and extending the arm, as well as rotating the forearm. Key structures include bones, muscles, tendons, ligaments, and nerves. Ligaments hold the bones together and provide stability, while muscles control motion. The joint is surrounded by a capsule filled with fluid to reduce friction. Proper function depends on the coordinated action of these parts to help you lift, grip, and throw objects smoothly and safely.