What is the number of fused vertebrae in the sacral spine?

The sacral spine consists of five fused vertebrae. This fusion forms a single, triangular-shaped bone known as the sacrum, which is located at the base of the lumbar vertebrae and above the coccyx (tailbone). The sacrum plays a critical role in connecting the spine to the pelvis and is important for both structural support and weight transfer between the upper body and lower limbs.

Understanding the anatomy of the sacral spine is essential for chiropractic assistants, as it is integral to various treatment approaches and assessments of spinal health. The fusion of these vertebrae provides stability and strength to the pelvic region, making it a vital area of focus in both diagnosis and treatment plans within chiropractic care.