Shoulder
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Shoulder Anatomy Overview
The shoulder is a highly flexible and mobile joint, allowing a wide range of motion for the arm. It is crucial for activities like lifting, throwing, and reaching, making it one of the most versatile joints in the body.
Bones of the Shoulder
The shoulder joint, also known as the glenohumeral joint, is formed where the head of the humerus (upper arm bone) fits into the shallow socket of the scapula (shoulder blade). The clavicle (collarbone) also plays a vital role in connecting the arm to the body and stabilizing the shoulder joint.
Soft Tissues
Several soft tissues support the shoulder, including muscles, tendons, and ligaments. The rotator cuff, a group of four muscles and their tendons, surrounds the shoulder joint, providing strength and stability during movement. Ligaments, such as the coracoclavicular and glenohumeral ligaments, help hold the bones in place, while cartilage, such as the labrum, acts as a cushion to reduce friction.
Nerves and Blood Supply
The primary nerves in the shoulder are part of the brachial plexus, which runs from the neck down into the arm, controlling sensation and muscle movement. The shoulder’s blood supply comes from the axillary artery, ensuring that the joint and surrounding muscles receive adequate oxygen and nutrients.
