Sacrum (Os sacrum)
Educational content only — not medical advice.
Anatomy
A triangular bone of five fused vertebrae sitting between the lumbar spine above and the hip bones on either side; it forms the back wall of the pelvis, transfers body weight to the legs and fuses with the coccyx below.
Clinical notes
Sacral fractures are rare and follow severe pelvic trauma; they may be accompanied by injury to the sacral nerve roots.
Related structures
Educational references
FAQ
What is the role of the Sacrum?
A triangular bone of five fused vertebrae sitting between the lumbar spine above and the hip bones on either side; it forms the back wall of the pelvis, transfers body weight to the legs and fuses with the coccyx below.
Why is the Sacrum clinically important?
Sacral fractures are rare and follow severe pelvic trauma; they may be accompanied by injury to the sacral nerve roots.
Source & license
Derived from Z-Anatomy (Gauthier Kervyn et al.), CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/); upstream geometry from BodyParts3D, © The Database Center for Life Science. license details