sacrum, pl. sacra (sa´krum, sa´kra) [NA]

The segment of the vertebral column forming part of the pelvis; a broad, slightly curved, spade-shaped bone, thick above, thinner below, closing in the pelvic girdle posteriorly; it is formed by the fusion of five originally separate sacral vertebrae; it articulates with the last lumbar vertebra, the coccyx, and the hip bone on either side.os sacrum [NA] , sacred bone, vertebra magna; [L. (lit. sacred bone), neuter of sacer (sacr-), sacred]
assimilation which is composed of six segments, the last lumbar vertebra assuming the appearance of a sacral segment; or one which is composed of but four segments, the first sacral being free and having the characteristics of a lumbar vertebra.


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