They are called as bursae. They reduce the friction of the muscle tendons.
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Most joints of the body are synovial joints, which are characterized by the presence of a synovial fluid-filled joint cavity. These joints allow for a wide range of movement due to the presence of articulating surfaces covered in hyaline cartilage and reinforced by ligaments. Examples include the knee, shoulder, and hip joints.
Synovial fluid is found in joints in the body, specifically within the synovial cavities of synovial joints. It serves to lubricate the joints, reduce friction, and provide nutrients to the surrounding cartilage.
Synovial fluid is a thick, stringy fluid found in the cavities of synovial joints. With its egg-like consistency (synovial comes from Latin for "egg"), synovial fluid reduces friction between the articular cartilage and other tissues in joints to lubricate and cushion them during movement.
Synovial fluid sacks are small fluid-filled sacs found in joints, called bursae, which help reduce friction between bones, tendons, and muscles during movement. These sacks contain synovial fluid, which lubricates the joint and provides cushioning to prevent wear and tear.
Synovial fluid is the lubricant that helps your joints move smoothly. It is a clear, viscous fluid found in the cavities of synovial joints.