(from Latin, sacrum: holy) The bone at the base of the spinal column. It is made of five vertebral bones fused together to form one triangular element: it sits at the bottom of the spinal cord, forming a key into the pelvic girdle. Sacral describes...

Portion of the lower part of the spine below the lumbar vertebrae and above the coccyx that forms a joint with the left and right...

The sacrum is a large, triangular bone at the base of the spine and at the upper and back part of the pelvic cavity, where it is inserted like a wedge between the two hip bones. Its upper part connects with the last lumbar vertebra, and bottom part with...