A collar of repair tissue forms around the external surface of each broken end. When a bridge is formed across the break it is known as the external callus. Depending on the richness of the periosteal capillaries, the callus will Be composed of either spongy bone or cartilage. Joints and Synovial Fluid Commection between any of the skeletons rigid component parts is known as a joint, also described as an articulation. Study of joints is termed arthrology and inflammation of joins is termed arthritis.
Arthritis is a common malady among domestic animals.
Synovial joints are those that allow surfaces to slide past one another Facilitated by the presence of articular cartilage on each bone surface of the articulation and by presence of synovial fluid. Synovial joint is enclosed by a joint capsule Synovial fluid is contained within the joint capsule and is secreted by iits inner membrane, the synovial membrane Outer layer of the joint capsule is a fibrous layer that extends from the periosteum of each bone and contributes to the stability of the joint. Synoviocytes within the synovial membrane synthesize synovial fluid by an active, energy-requiring process. Chief functions of synovial fluid are joint lubrication and nourishment of the articular cartilage. Sticky, viscous fluid, often egg-white in appearance, usually alkaline and ranges from colorless to deep yellow.