Vertebral column: The vertebral column is the central support structure of the skeleton, consisting of 33 vertebrae that house and protect the spinal cord.
Sacrum:The sacrum is a large, triangular bone at the base of the spine, formed by five fused vertebrae, connecting with the coccyx and iliac bones to support the pelvis.
Coccyx:Also known as the tailbone, the coccyx is a small triangular bone at the very bottom of the vertebral column, comprising three to five fused vertebrae and serving as an attachment point for ligaments and muscles of the pelvic floor