The scapula, commonly known as the shoulder blade, is a flat, triangular bone located in the upper back. It connects the humerus (the bone of the upper arm) to the clavicle (collarbone) and plays a crucial role in shoulder movement and stability. The scapula has several important features, including the glenoid cavity, which forms a socket for the humerus, allowing for a wide range of arm motion. In addition to its structural functions, the scapula serves as an attachment point for various muscles, including the deltoid and rotator cuff muscles. These muscles are essential for lifting, rotating, and stabilizing the arm during various activities. The scapula's unique shape and position contribute significantly to the overall function of the shoulder joint.