The sacrum (pl.: sacra or sacrums[1]), in human anatomy, is a triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1–S5) between ages 18 and 30.

Oct 23, 2025 · The sacrum is a single bone made from five fused vertebrae that connects the spine to the pelvis. It supports the body's core, especially when sitting or standing, and helps with balance …

Nov 6, 2025 · The sacrum is a large, triangular bone at the terminal end of the vertebral column. It forms the posterior wall of the pelvis and plays a key role in weight transmission from the axial skeleton to …

Dec 27, 2021 · The sacrum is a large, flat, triangular-shaped, irregular bone, alternatively known as the sacral vertebra or sacral spine. It comprises five fused vertebrae (S1-S5), located at the base of the …

Nov 21, 2025 · The sacrum is a large, triangular bone situated at the base of the vertebral column. It is the final segment of the spine, positioned just above the coccyx, or tailbone.

The sacrum is a triangular-shaped bone that forms the foundation of the spine, connecting it to the pelvis. The sacral vertebrae, sacral hiatus, and sacral foramina are essential anatomical features that …

Sep 12, 2025 · The sacrum is a triangular, wedge-shaped bone formed by the fusion of five sacral vertebrae and positioned between the lumbar spine and the coccyx. It forms the posterior wall of the …

Oct 30, 2023 · Regarded as the keystone of the human body, the sacrum is important because it forms a link between the spine and the iliac bones, and also has an important part to play in hip stability.

Nov 25, 2024 · The sacrum is at the bottom of the spine. The lumbosacral joint commonly causes back pain. Learn more.

The sacrum is the triangular bone just below the lumbar vertebrae. The sacrum has five segments fused together into one large bone. In the months before birth, these vertebrae grow together into one bone …