In which region of the spine are 5 fused vertebrae located?

The five fused vertebrae are located in the sacrum, which is a triangular-shaped bone situated at the base of the vertebral column. The sacrum is formed by the fusion of five individual vertebrae during the development of the skeletal system. This fusion provides stability and structural support to the pelvis, where it connects with the hip bones. The sacrum plays a crucial role in transferring weight from the upper body to the lower limbs while walking and standing.

In contrast, the cervical region consists of seven individual vertebrae, the thoracic region consists of twelve individual vertebrae, and the lumbar region comprises five individual vertebrae. Each of these regions has its own specific functions and characteristics, but none feature fused vertebrae like the sacrum does.