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site where two or more bones meet
Functions of joints
Functions of joints:
Give skeleton mobility
Hold skeleton together
Functional Classification of Joints
slightly movable (amphiarthrosis)
- freely movable (diarthrosis)
- Three STRUCTURAL classifications:
- Fibrous (mainly immoveable)
- Cartilaginous (partially moveable)
- Synovial (freely moveable)
Joint held together with very short,interconnecting fibers, and bone edgesinterlock. Found only in the skull.
- Joint held together by a ligament.
- Fibrous tissue can vary in length, but is longer than in sutures.
- “Peg in socket” fibrous joint.
- Periodontalligament holds tooth in socket.
- Bones united by hyaline cartilage
- SymphysesBones united by fibrocartilage
- All are freely moveable (diarthrotic)
- Include all limb joints; most joints of the body
- All have:
- --Joint capsule lined with synovial membrane
- --The synovial membrane produces fluid
- --Ligaments (inside and outside joint)
--Extra fibrous sacs lined with synovial membranes, and containing synovial fluid
--Placed where ligaments, muscles, skin, tendons, or bones rub together to reduce friction at joint