What are small sacs of fluid between shoulder tendons and bones called?

The correct answer is "bursa," which refers to small fluid-filled sacs that act as cushions between the bones and tendons or muscles around a joint. The primary function of a bursa is to reduce friction and allow for smooth movement during joint activities. These sacs contain synovial fluid, which lubricates the joints and helps minimize wear and tear on the surrounding tissues.

In the context of the shoulder, bursae play a crucial role in facilitating movement and preventing inflammation or injury by providing cushioning and reducing friction between the shoulder tendons and bones. Understanding the anatomy and functionality of bursae is important for anyone studying or practicing in the field of cosmetology or health, particularly in relation to any physical therapy or massage techniques that may involve movement or manipulation of the shoulder area.