organ synovial bursa http://upload.wikimedia.org/wikipedia/commons/b/b3/Gray350.png galen:Bursa bursa synovialis bursa UBERON:0003668 FMA:9692 UMLS:C0006441 A small fluid-filled sac lined by synovial membrane with an inner capillary layer of slimy fluid. It provides a cushion between bones and tendons and/or muscles around a joint. This helps to reduce friction between the bones and allows free movement. Bursae are filled with synovial fluid and are found around most major joints of the body. NCIT:C33717 uberon MESH:D002061 GAID:252