This lines the joint cavity and consists of two cell types: type A cells with a prominent Golgi apparatus, numerous vesicles and vacuoles, and many mitochondria; and type B cells, with a large endoplasmic reticulum and a few vacuoles that secrete hyaluronan. The functions of the synovial membrane include:
Secretion of sticky mucoid substance into synovial fluid, which lubricates the joint and nourishes the avascular articular cartilage; Allows for changes in the joint cavity shape and size associated with normal joint movement, as a result of flexibility, loose synovial folds, villi and marginal recesses; Aids in removal of substances from the joint cavity.
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