Final answer:
The labrum indeed helps provide stability to the glenohumeral joint by deepening the socket for the humerus, although the primary support comes from the rotator cuff muscles.
Step-by-step explanation:
Glenohumeral Joint Stability
True, the labrum is a fibrocartilaginous ring that contributes to the stability of the glenohumeral joint, which is the shoulder joint. The glenoid labrum extends around the margin of the glenoid cavity of the scapula. Although the rotator cuff muscles are the primary source of support for the glenohumeral joint, the labrum deepens the socket and provides a more secure fit for the head of the humerus, enhancing joint stability. This helps to allow for the wide range of movements, such as flexion/extension, abduction/adduction, circumduction, and medial/lateral rotation, that the shoulder is capable of performing.