Sacrum
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The five bones fused in the lower back are called the sacrum. The sacrum is a triangular bone located between the two hip bones and forms the back part of the pelvis. It is made up of five separate vertebrae that fuse together during development.
The vetebrae of the lower back are called lumbar vertebrae. Lower than that, the vertebrae are fused together in the sacrum, and the lowest part of the spine is the tailbone or coccyx.
There are 5 regions in the spine:cervical (7 vertebrae)thoracic (12)lumbar (5)sacral (5 fused)coccygeal (4 fused)
The spinal cord is not a bone; it is a long, thin, tubular bundle of nervous tissue and support cells that extends from the base of the brain to the lower back. It is surrounded and protected by the vertebral column, which is made up of individual bones called vertebrae.
The sacrum is located in the lower part of the back, between the two pelvic bones. It is a triangular-shaped bone situated at the base of the spine, just above the tailbone (coccyx).
The sacrum is a triangular bone located at the base of the spine, between the two hip bones. It forms the back wall of the pelvis. The coccyx, also known as the tailbone, is a small triangular bone at the bottom of the spine, below the sacrum.