👉 The envelope fluid, also known as synovial fluid, is a viscous, lubricating substance found within synovial joints. It acts as a cushion between the articular cartilage surfaces of bones, reducing friction during joint movement and absorbing shock to protect against wear and tear. Composed primarily of water, proteins, hyaluronic acid, and various ions, this fluid also provides nutrients to the cartilage and helps maintain its smooth, slippery surface. This essential lubricant plays a crucial role in ensuring the efficient and pain-free movement of joints throughout the body.
