2. Articular Cartilage

Articular cartilage exists in a thin layer over the ends of bones that interact within synovial joint cavities. This cartilage contains chondrocytes, cells that produce a thick liquid component of synovial fluid -- lubricin. There are no blood vessels within articular cartilage, so nutrients are obtained from synovial fluid.

knees synovial fluid VIKTORIYA KABANOVA / Getty Images


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