joints


joints

Junctions between bones whether or not obvious movement is possible. There are three types-fibrous, cartilaginous, and synovial. Fibrous joints, such as those between the bones of the vault of the skull (CRANIUM) allow little or no movement. Cartilaginous joints, such as those between the ribs and the breast-bone (sternum), allow limited movement. Synovial joints, such as the shoulder, elbow, hip and knee joints, are freely movable and have lubricated bearing surfaces. Synovial joints are enclosed in capsules and are reinforced by internal and external ligaments. The range of movement varies with the construction of the joint.