. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 122 PELVIS. the innominate bone posteriorly; and a single joint in front, uniting the innominate bones to each other. The three latter joints are of the kind usually denominated " si/m- physis" and considered by many as included also iq the class " amphi-arthrosis" The sacro-iliac joints, however, most fre- quently presenting two contiguous surfaces and two separate plates of incrusting cartilage, ought rather, as Albums remarked, to be considered as "arthyodial" forms of articulation, while
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 122 PELVIS. the innominate bone posteriorly; and a single joint in front, uniting the innominate bones to each other. The three latter joints are of the kind usually denominated " si/m- physis" and considered by many as included also iq the class " amphi-arthrosis" The sacro-iliac joints, however, most fre- quently presenting two contiguous surfaces and two separate plates of incrusting cartilage, ought rather, as Albums remarked, to be considered as "arthyodial" forms of articulation, while the pubic symphysis occupies an intermediate or transitional position between the fibro-carli- laginous or mixed, and the arthrodial joints. The sacro-coccygral joint is composed of a fibro-cartilaginous disc, and an anterior and posterior ligament. The fibro-cartilaginous disc is a miniature of the intervertebral, inter- vening between and adherent to the opposed articular surfaces of these bones, being, how- ever, less evidently pulpy in the centre. Ac- cording to Cruveilhier, there is sometimes found a synovial membrane in the centre of this joint. The anterior sacro-coccj/geal liga- ment consists of a thin layer of fibres passing from one bone to the other in front of the joint, and spreading over the whole coccv- geal surface. _ The posterior sacro-coccifgeal ligament is much stronger and more developed. It springs from the edges of the notched in- ferior opening of the sacral canal by a thick band of fibres, which includes also, as an in- vesting capsular ligament, lined by a synovial membrane, the articular extremities of the sacral horns, and, gradually narrowing down- wards, is attached to, and extends over, the whole posterior surface of the coccyx and its articular processes, covering in the inferior aperture of the sacral canal, and connecting the several pieces of the coccyx when they remain separate. In the latter case also are found intra-coccugeal articulation
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