Cauda equina refers to the bundle of nerves located at the bottom of the spinal cord. In medical terminology, it is often referred to as the terminal filum or caudal nerve roots. Other synonyms for cauda equina include tail of the horse, horse's tail, cauda equina syndrome, lumbar nerve roots, sacral nerve roots, and filum terminale. While each of these terms may have some variations in meaning, they all refer to the nerve endings near the base of the spine which play an important role in the body's movement, control, and sensation. Understanding these terms is crucial for anyone seeking medical treatment for nerve pain, spinal cord injuries, or other conditions impacting the lower back and legs.