cauda helicis cauda helicis in the lower part of the helix the cartilage is prolonged downward as a tail-like process, the cauda helicis; this is separated from the antihelix by a fissure, the fissura antitragohelicina. cauda heliciscranial surface of cartilage of right auricula. (cauda helicis labeled at bottom right.)identifiersta98a15.3.01.008ta2953fma61028anatomical terminology