Joint is the place at which two or more bones meet in the skeleton of the body. This place is also called an articulation. Joints may be fixed or movable. Fixed joints are seams between bones that lie directly against each other, or are separated only by a thin layer of connective tissue. In case of a blow or an accident, these joints may absorb just enough shock to keep the bones from breaking. The joints of the cranium (covering of the brain) are fixed and protect the brain.