Definition
The triangular bone at the base of the spine, formed by five fused vertebrae (S1-S5). It connects the spine to the pelvis and is where the lower nerve roots of the sciatic nerve originate.
Sacral Spine
anatomyThe sacral spine, or sacrum, is the triangular bone at the base of the spine, made of five vertebrae (S1 to S5) that fuse together during early adulthood. It sits between the two hip bones and joins the spine to the pelvis through the sacroiliac joints. Several nerve roots that form the sciatic nerve leave the spine through openings in the sacrum.
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