The word cauda is Latin for “tail”. A syringomyeliaA cavity, within the spinal cord, which is filled with cerebrospinal fluid. Syringomyelia cavities come in various “shapes and sizes”, from short, spindle-shaped cavities through to long, tense cavities extending throughout the greater part of the spinal cord. Read more cavity which is seen to enlarge progressively downward is expanding in a caudal direction.