The Glenoid Labrum (Glenoid Ligament) is a fibrocartilaginous rim attached around the margin of the Glenoid cavity in the Shoulder Blade. The Shoulder Joint is considered as a 'ball and socket' joint. However, in bony terms the 'socket' (the glenoid fossa of the Scapula) is quite shallow and small, covering only a third of the 'ball' (the head of the Humerus). The socket is deepened by the Glenoid Labrum.
- The Labrum is triangular in section; the base is fixed to the circumference of the cavity, while the free edge is thin and sharp.
- It is continuous above with the tendon of the long head of the biceps brachii, which gives off two fasciculi to blend with the fibrous tissue of the Labrum.
- It deepens the articular cavity, and protects the edges of the bone.