A treatise on the science and practice of midwifery . etween the sacrum and coccyx, and it is supposed that this is formedunder the influence of the movements of the bones on each other. Sacro-iliac Synchondrosis.—The opposing articular surfaces of thesacrum and ilium are each covered by cartilages, that of the sacrumbeing the thickest. These are firmly united, but, in the female,according to Mr. Wood,1 they are always more or less separated byan intervening synovial membrane. Posterior to these cartilaginousconvex surfaces there are strong interosseous ligaments, passingdirectly from bone to
A treatise on the science and practice of midwifery . etween the sacrum and coccyx, and it is supposed that this is formedunder the influence of the movements of the bones on each other. Sacro-iliac Synchondrosis.—The opposing articular surfaces of thesacrum and ilium are each covered by cartilages, that of the sacrumbeing the thickest. These are firmly united, but, in the female,according to Mr. Wood,1 they are always more or less separated byan intervening synovial membrane. Posterior to these cartilaginousconvex surfaces there are strong interosseous ligaments, passingdirectly from bone to bone, filling up the interspace between them,and uniting them firmly. There are also accessory ligaments, suchas the superior and anterior sacro iliac, which are of secondary con-sequence. The posterior sacro-iliac ligaments, however, are of greatobstetric importance. They are the very strong attachments whichunite the rough surfaces on the posterior iliac tuberosities to theposterior and lateral surfaces of the sacrum. They pass obliquely Fig. Section of Pelvis and Heads of Thigh-bones, showing the Suspensory Action of the Sacro-iliac ?Ligaments. (After Wood.) downwards from the former points, and suspend, as it were, thesacrum from them. According to Duncan, the sacrum has nothingto prevent its being depressed by the weight of the body but these Todds Cyclopaedia of Anatomy and Physiology, article Pelvis, p. 123. 30 ORGANS CONCERNED IN PARTURITION. ligaments, and it is mainly through, them that the weight of the bodyis transmitted to the sacro-cot)doid beams and the heads of the femur. Sacro-sciatic Ligaments.—The sacro-sciatic ligaments are instru-mental in completing the canal of the pelvis. The greater sacro-sciatic ligament is attached by a broad base to the posterior spine ofthe ilium, and to the posterior surfaces of the ilium and coccyx. Itsfibres unite into a thick cord, cross each other in an X-like manner,and again expand at their insertion into the tuberosi
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Keywords: ., bookcentury1800, bookdecade1870, bookidtre, booksubjectobstetrics
