. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PELVIS. 117 lowed, rough, and broad in front, for the attachment of some muscles of the leg. There are numerous nutritious openings on this sur- face of theischium and pubis, which are chiefly directed towards the cotyloid cavity. Fig. Internal view of the os innominatum, The infernal or pelvic surface presents for examination a superior or iliac portion di- rected forwards, upwards, and inwards, and an inferior ischio-pubic portion directed in- wards and backwards. The iliac portion is rough at the posterior third,
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PELVIS. 117 lowed, rough, and broad in front, for the attachment of some muscles of the leg. There are numerous nutritious openings on this sur- face of theischium and pubis, which are chiefly directed towards the cotyloid cavity. Fig. Internal view of the os innominatum, The infernal or pelvic surface presents for examination a superior or iliac portion di- rected forwards, upwards, and inwards, and an inferior ischio-pubic portion directed in- wards and backwards. The iliac portion is rough at the posterior third, and is marked by a thick, massy, irre- gular prominence, just below the posterior extremity of the crest, which is continued to the posterior superior spine, and serves for the attachment of powerful ligaments which connect this bone to the sacrum. This may be called, for brevity, the iliac tuberosity (1). An inch and a half below this is an angu- lar or semilunar articular surface, the sacral, or .auricular (<J), to which the sacrum is at- tached in the complete pelvis. This surface is generally more or less rough and irre- gular, for the more firm attachment of the articular cartilage. It is composed of two elongated portions placed at right angles to each other, of which the inferior is the longer, and is directed horizontally backwards to the posterior interior spine, parallel with and close above the upper boundary of the great sciatic notch (m, n), while the superior is directed vertically upwards towards the crest of the ilium, to which its raised anterior border is prolonged by a well marked ridge (3). At the angle of junction of these two limbs is gene- rally to be seen a deep hollow, while the ex- tremity of the inferior limb is bevelled off to correspond to elevations on the opposed sur- faces of the sacrum. In the retiring an^le formed bv the auricular surface is a very roujjh depression for the attachment of inter-osseous ligaments (7). The anterior two thirds
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