articulations

Articulations:

Synarthroses are joints that do not move, such as sutures. The bone ends are joined by fibrous tissue

Amphiarthroses are slightly movable. Typically, these joints are connected by a cartilage disc. Some amphiathroses are the pubic symphysis and the vertebral column

Diarthroses are freely movable joints. Nonaxial joints have flat are only slightly curved bones to allow slipping of the articulations. Also called plane joints, the carpals are a good example. Uniaxial joints can move on mainly one plane, such as the elbow. There are also biaxial and multiaxial joints, such as the thumbs, base of the fingers (biaxial), and the hip (multiaxial). Diathrotic joints have four main parts:

Articular cartilage-- hyaline covering the ends of the bones fibrous
Articular capsule-- the joint surfaces are embraced by the smooth synovial membrane, filled with thick, clear synovial fluid. It is for this attribute that they are also called synovial joints
Joint cavity-- the articular capsule encloses the synovial fluid to make up this cavity
Reinforcement ligaments-- such as the ACL in the knee, keep the joint stable and move it with the aid of skeletal muscle. These tendons are often cushioned with bursa, synovial membrane sacs of synovial fluid