The S5 vertebra, also known as the fifth sacral vertebra, is located in the sacrum region below the S4 vertebra and above the coccyx (tailbone). The sacrum is a large triangular-shaped bone at the base of the spine that connects to the pelvis.
The S5 vertebra plays an important role in providing support to the pelvis and transferring weight from the upper body to the legs. It also helps protect the spinal cord and nerve roots that pass through the spinal canal in the sacrum. S5 nerves primarily affect the perineal area (the region between the anus and external genitalia).
