The shoulder blade, also known as the scapula, is a flat, triangular bone located on the back of the shoulder. It connects the upper arm bone, or humerus, to the collarbone, or clavicle. The shoulder blade plays a crucial role in shoulder movement and stability, allowing for a wide range of motion in the arm. Each person has two shoulder blades, one on each side of the body. The shoulder blades are important for various activities, such as lifting, throwing, and reaching. They also serve as attachment points for several muscles, including the rotator cuff muscles, which help stabilize the shoulder joint.