What is the function of the subscapular bursa?

The subscapular bursa is a small sac filled with synovial fluid located between the subscapularis muscle and the scapula. Its primary function is to decrease friction and provide a cushioning effect, especially during movements of the shoulder. By preventing the tendon of the subscapularis from rubbing directly against the scapula, the bursa helps to protect the tendon from wear and tear, which can lead to inflammation or other injuries.

This anatomical function is essential for maintaining normal biomechanics during shoulder activities, especially those involving rotation and lifting. By mitigating friction, the subscapular bursa plays a critical role in preserving tendon integrity and promoting smooth movement.

Other options do not accurately reflect the focus of the subscapular bursa's function. While enhancing shoulder stability, supporting ligaments, or lubricating the rotator cuff muscles relate to shoulder joint function, they are not primary roles of the subscapular bursa specifically. Instead, these aspects are more associated with the overall anatomy and physiology of the shoulder complex.