The shoulder girdle, also known as the pectoral girdle, is a bony structure that connects the upper limb to the trunk. It consists of two main bones: the clavicle (collarbone) and the scapula (shoulder blade). This structure provides support and stability for arm movements and allows for a wide range of motion. The shoulder girdle plays a crucial role in various activities, such as reaching, lifting, and throwing. It also serves as an attachment point for several muscles, including the deltoid and rotator cuff muscles, which are essential for shoulder movement and strength.