![]() ![]() On the left and right lateral sides the sacrum forms the sacroiliac joints with the ilium of the hip bones to form the rigid pelvis. ![]() The sacrum tapers to a point at its inferior end, where it forms the fibrocartilaginous sacrococcygeal joint with the tiny coccyx (tail bone). “A composite, symmetrical, triangular bone which articulates laterally with the ilia, forming the dorsal (back) wall of the pelvis and resulting from the ankylosis (fusion) of two or more vertebrae between the lumbar and coccygeal regions of the spinal column.” Which bone is lateral to the sacrum? It is remarkably thick, which aids in supporting and transmitting the weight of the body. The sacrum is a large bone located at the terminal part of the vertebral canal, where it forms the posterior aspect of the pelvis. The irregular bones are: the vertebræ, sacrum, coccyx, temporal, sphenoid, ethmoid, zygomatic, maxilla, mandible, palatine, inferior nasal concha, and hyoid. They consist of cancellous tissue enclosed within a thin layer of compact bone. The sacrum, sometimes called the sacral vertebra or sacral spine (S1), is a large, flat triangular shaped bone nested between the hip bones and positioned below the last lumbar vertebra (L5).
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