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Synovial specializations. Distinct patterns of cavitation of the interzone (green) can generate simple synovial joints (a) or joints with specialized structures such as menisci (b) and articular discs (c). The synovium (orange) shares many properties with the fibroblasts ensheathing the menisci and disc (purple). Bony processes (red) act as attachment points for ligaments (green), with their connection point, or enthesis, consisting of a transitional cell type.
