Friday, June 26, 2015

1.1.9

Outline the features of a synovial joint.

Articular cartilage: layer of cartilage that covers articulating surfaces of the bones (usually hyaline but can be fibrocartilage). Its function is to reduce friction, absorb sock, and protect the bones. It varies in thickness depending on the amount of stress that it is exposed to.
Synovial membrane: lines the inside of the capsule and secretes synovial fluid.
Synovial fluid: released by the synovial membrane. Has the consistency and appearance of uncooked egg whites. It lubricates the joint cavity, reduces friction, and provides nutrients to the cartilage.
Bursae: small, fluid-filled sacs found where two structures rub together (between ligament and bone/tendon and bone/skin and bone). Provide lubrication and therefore reduce friction.
Meniscus: discs of fibrocartilage that are found between some articulation bones (usually between bones that are not well matched in shape). It allows for bones to fit together more tightly. Provides greater cushioning and stability to the joint.
Ligaments: connects bone to bone and provides support.
Articular capsule: a sleeve-like structure that surrounds a joint. It is flexible enough to allow movement while also preventing dislocation. (In some cases the fibers of the capsule are arranged in parallel bundles to form ligaments, which provide support.)

No comments:

Post a Comment