The humeral head is the rounded top part of the humerus, which is the long bone in the upper arm. It fits into the shallow socket of the scapula, forming the shoulder joint. This ball-and-socket joint allows for a wide range of motion in the arm, enabling activities like lifting and throwing. The humeral head is covered with a smooth layer of cartilage, which helps reduce friction during movement. It is also surrounded by muscles and tendons that provide stability and support. Injuries or conditions affecting the humeral head can lead to pain and limited mobility in the shoulder.