. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. O u. A, anterior surface and base of sacrum ; B, lateral and posterior view of the same bone; c, anterior surface and base of coccyx. the sacral canal at its inferior termination, where it is much compressed antero-poste- riorty. On each side of the sacral crest is a narrow vertical groove, corresponding to the vertebral laminae, and bounded externally by four rough tubercles, the articular (4-), the last of which are confounded with the bifurcated inferior spine, and project downwards in two inferior sacral horns (5
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. O u. A, anterior surface and base of sacrum ; B, lateral and posterior view of the same bone; c, anterior surface and base of coccyx. the sacral canal at its inferior termination, where it is much compressed antero-poste- riorty. On each side of the sacral crest is a narrow vertical groove, corresponding to the vertebral laminae, and bounded externally by four rough tubercles, the articular (4-), the last of which are confounded with the bifurcated inferior spine, and project downwards in two inferior sacral horns (5), which are smoothed into facets posteriori}', to articulate with the coccyx. They correspond to the articular processes of the vertebras. Immediately ex- ternal to them, and on the same level, are the four posterior sacral foramina (6), of irregular size, but much smaller than the anterior, to which they are opposed in situation. The broad surfaces of bone between them present another continuous shallow vertical groove, external to which are three or four tubercles, the transverse (7), arranged vertically parallel with the holes, and corresponding to the tips of the transverse processes of the vertebrae. The highest of these are sometimes smoothed into a facet externally (8), by impinging upon the iliac tuberosity, and the fourth (9) is al- ways the largest and most prominent for the attachment of the superficial posterior sacro- iliac ligaments. Close to the lateral boun- dary, opposite the two upper transverse tubercles, are two very rough, digital impres- sions for the insertion of powerful posterior sacro-iliac ligaments. The lateral surfaces of the sacrum (Jig. B) are broad above, and taper gradually downwards. When opposite the two last sacral vertebras, they become narrow borders (rf). Above, at the three upper vertebrae, they oppose the inner surface of the ilia — below, they form the inner margin of the great sciatic notch. At the upper broader portion these surfa
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Keywords: ., bo, booksubjectanatomy, booksubjectphysiology, booksubjectzoology
