Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of S1-S5 (sacral vertebrae)
Medically reviewed by Min Clinic Staff | Updated: January 2026
S1-S5 (sacral vertebrae): The first sacral vertebra through the fifth sacral vertebra.
There are 5 sacral vertebral bones. They are represented by the symbols S1 through S5.
The sacral vertebrae are situated in the spinal column just below the lumbar vertebrae and right above the coccyx, which is the lowest segment of the vertebral column. The sacral vertebrae are normally found fused together to form the sacrum.