answer from : Quest synovial joints are characterized by the presence of a articulation cavity. the walls of this space are formed by the articular ejection seat, a fibrous connective tissue structure that is attached to each bone merely outside the sphere of the bone ’ s articulating surface. the bones of the roast articulated with each early within the joint cavity. clash between the bones at a synovial joint is prevented by the bearing of the articular cartilage, a thin level of hyaline cartilage that covers the integral articulating airfoil of each bone. however, unlike at a cartilaginous joint, the articular cartilages of each cram are not continuous with each other. alternatively, the articular cartilage acts like a teflon® coating over the cram open, allowing the articulating bones to move smoothly against each other without damaging the underlying bone tissue. lining the inner surface of the articular capsule is a thin synovial membrane. the cells of this membrane secrete synovial fluid ( synovia = “ a thick fluid ” ), a thick, despicable fluent that provides lubrication to foster reduce clash between the bones of the joint. this fluid besides provides nourishment to the articular cartilage, which does not contain blood vessels. the ability of the bones to move smoothly against each other within the roast cavity, and the freedom of joint motion this provides, means that each synovial articulation is functionally classified as a synovial joint. outside of their joint surfaces, the bones are connected together by ligaments, which are potent bands of hempen conjunction tissue. these strengthen and support the joint by anchoring the bones together and preventing their separation. ligaments allow for normal movements at a joint, but limit the range of these motions, frankincense preventing excessive or abnormal joint movements. ligaments are classified based on their relationship to the hempen articular capsule. an extrinsic ligament is located outside of the articular encapsulate, an intrinsic ligament is fused to or incorporated into the wall of the articular encapsulate, and an intracapsular ligament is located inside of the articular encapsulate.
at many synovial joints, extra digest is provided by the muscles and their tendons that dissemble across the joint. a tendon is the dense connective tissue structure that attaches a muscle to bone. as forces acting on a roast addition, the body will mechanically increase the overall force of compression of the muscles crossing that joint, frankincense allowing the muscle and its tendon to serve as a “ dynamic ligament ” to resist forces and support the articulation. this type of collateral support by muscles is very crucial at the shoulder joint, for exercise, where the ligaments are relatively decrepit.
extra structures associated with synovial joints a few synovial joints of the body have a fibrocartilage structure located between the articulating bones. this is called an articular disk, which is generally small and egg-shaped, or a meniscus, which is larger and c-shaped. these structures can serve respective functions, depending on the specific joint. in some places, an articular magnetic disk may act to powerfully unite the bones of the roast to each other. examples of this include the articular disk found at the sternoclavicular joint or between the distal ends of the spoke and ulna bones. at early synovial joints, the disk can provide jolt concentration and cushioning between the bones, which is the function of each meniscus within the knee joint. last, an articular magnetic disk can serve to smooth the movements between the articulating bones, as seen at the temporomandibular joint. some synovial joints besides have a fatty embroider, which can serve as a shock absorber between the bones .
