What makes up the glenoid cavity

The biceps tendon attaches the biceps muscle to the shoulder and helps to stabilize the joint. Four short muscles originate on the scapula and pass around the shoulder where their tendons fuse together to form the rotator cuff. All of these components of the shoulder, along with the muscles of the upper body, work together to manage the stress the shoulder receives as you extend, flex, lift, and throw.

Skip to main content. You are here Home Specialties Shoulder. Anatomy of the Shoulder. These two joints work together at the arm to allow the shoulder to move in a large circle and to rotate around its axis. This extensive range of motion makes the shoulder joint fairly unstable. This instability is countered by the strength of the rotator cuff muscles, tendons, ligaments, and the glenoid labrum.

The bones of the shoulder consist of the humerus upper arm bone , the scapula shoulder blade , and the clavicle collar bone. Let's dive into the shoulder anatomy. Sometimes it is easier to understand anatomy when you look at a visual representation. Click here to watch an anatomy video about the shoulder joint anatomy. Bones in the Shoulder. The scapula is a triangular-shaped bone that functions mainly as a site for muscular attachment.

Four rotator cuff muscles that act on the shoulder begin at the scapula. These muscles are the supraspinatus, infraspinatus, Teres minor, and subscapularis. In addition, the trapezius, serratus anterior, rhomboids, and Levator scapulae insert on the scapula and are responsible for scapular mobility and stability. The glenoid fossa is the socket of the shoulder joint. This part of the shoulder is a ball and socket joint.

The head of the Humerus fits into the Glenoid fossa, though it is a shallow socket. The clavicle is an S-shaped bone that forms the front portion of the shoulder girdle and keeps the arm away from the trunk, allowing it to move freely. The clavicle consists of two joint articulations: the sternoclavicular joint and the acromioclavicular joint. The sternoclavicular joint is the only skeletal connection between the axial main skeleton and the upper extremity. Furthermore, the clavicle provides protection to the important underlying veins, arteries, and nerves that run in the front and back of the structure.

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