https://doi.org/10.1351/goldbook.11664
Bundle of long spinal nerve roots arising from the end of the spinal cord and filling the lower part of the spinal canal (from approximately the thoraco-lumbar junction downwards).
Note: These nerves contribute to the innervation of the pelvic organs and lower limbs to include motor innervation of the hips, knees, ankles, feet, and internal and external anal sphincter. In addition, the cauda equina extends to sensory innervation of the perineum and, partially, parasympathetic innervation of the bladder.