The shoulder blade, also known as the scapula, is a flat, triangular bone located on each side of the upper back. It connects the humerus (the upper arm bone) to the clavicle (collarbone) and plays a crucial role in shoulder movement and stability. The shoulder blade has several important features, including the glenoid cavity, which forms the socket for the shoulder joint. The shoulder blade is essential for various arm movements, such as lifting, reaching, and throwing. It provides attachment points for several muscles, including the rotator cuff and the trapezius, which help facilitate these movements. Proper function of the shoulder blade is vital for overall upper body strength and mobility.