. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PELVIS. 125 anterior or internal surface are blended the fibres of the ischio-coccygeus muscle, which exclude it from the ischio-rectal fossa, and render it rough when dissected. Soemmering describes the lower part of the powerful lumbar fascia as a ligament connect- ing the ilia to each other posteriorly and to the lower spines of the sacrum. This fascia does, doubtless, act powerfully in clasping the ilia upon the sacrum between them. He calls it the lateral sacro-iliac ligament, or the posterior lateral iliac ligament
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PELVIS. 125 anterior or internal surface are blended the fibres of the ischio-coccygeus muscle, which exclude it from the ischio-rectal fossa, and render it rough when dissected. Soemmering describes the lower part of the powerful lumbar fascia as a ligament connect- ing the ilia to each other posteriorly and to the lower spines of the sacrum. This fascia does, doubtless, act powerfully in clasping the ilia upon the sacrum between them. He calls it the lateral sacro-iliac ligament, or the posterior lateral iliac ligament. The important part which these three ac- cessory ligaments play in the mechanism of the pelvis will be hereafter shown. The movements of the sacro-iliac joint are very limited indeed, its principal characteristic being compactness and strength, with just sufficient sliding motion downwards and back- wards to break the shock of concussion pass- ing from the lower extremities to the trunk. This is said by some to be increased in preg- nancy and by parturition. The pubic symphysis (Jig. 80. 2) is an azygos joint uniting the innominate bones by their pubic portions in front. The osseous surfaces composing it are oval, with the long diameter directed downwards and backwards, and ge- nerally an inch and a half long, by three quarters broad. The planes of these sur- faces not being directly opposed to each other, leave a larger interval of separation in front than behind. This interval is filled by a fibro- cartilaginous disc, which is correspondingly thicker in front, where the fibrous components are so numerous and strong as to constitute almost an interosseous ligament, and pass from one bone to the other in an oblique and concentric direction. Towards the central and posterior part this disc is generally mainly cartilaginous in structure, and is often, in females, separated in the middle by a chink forming two smooth, plane, oval contiguous articular surfaces, of various dimens
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