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Amphiarthrosis. Mixed articulations

In this form of articulation, the contiguous osseous surfaces are connected together by broad flattened discs of fibre-cartilage, which adhere to the ends of both bones, as in the articulation between the bodies of the vertebrae, and first two pieces of the sternum; or the articulating surfaces are covered with fibro-cartilage, lined by a partial synovial membrane, and connected together by external ligaments, as in the sacro-iliac and pubic symphyses; both these forms being capable of limited motion in every direction. The former resemble the synarthrodial joints in the continuity of their surfaces, and absence of synovial sac; the latter, the diarthro-dial. These joints occasionally become obliterated in old age: this is frequently the case in the inter-pubic articulation, and occasionally in the intervertebral and sacro-iliac.




























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