The glenoid cavity is a shallow, cup-shaped structure located in the scapula, or shoulder blade. It serves as the socket for the humerus, the bone of the upper arm, forming the glenohumeral joint. This joint allows for a wide range of motion in the shoulder, making it essential for various arm movements. The glenoid cavity is surrounded by a fibrocartilaginous rim called the glenoid labrum, which deepens the socket and provides stability. The design of the glenoid cavity enables the shoulder joint to be highly mobile, but it also makes it more susceptible to dislocations and injuries.