Pelvic Girdle: Sacrum

The sacrumTriangular bone formed by fusion of five vertebrae; connects spine to pelvis. along with the coxal or hip bones and the coccyxTailbone; small, fused vertebrae at the end of the sacrum. is part of the pelvic girdle. The pelvic girdle is where the legs attach to the body. The pectoral girdle is where the arms attach to the body.  Sometimes people will refer to the sacrum as their tailbone. However sometimes people will also refer to the coccyx as their tailbone. In all reality the coccyx or the sacrum are actually bones resulting from the fusing of vertebrae.  We can refer to the fused vertebrae by number like the other vertebrae such as S1, being the most superiorAbove or toward the upper part of the body..   

On the posterior face of the sacrum is the medial sacral crestRidge down the midline of the sacrum formed by fused spinous processes..  This structure is a remnant of the spinous processes of the fused vertebrae.  Lateral to the median sacral crest are these lines of little holes called foramina.  These holes are where nerves and arteriesBlood vessels that carry oxygenated blood away from the heart (except pulmonary arteries, which carr penetrate the sacrum and are officially called the sacral foraminaOpenings on the sacrum for passage of nerves and blood vessels..  

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