There is really no need for such terms as "caudo-cranial" and "cranio-caudal". But, these terms appears in textbooks (esp. the old ones). So, we need to cope with them. Here is an explanation...from one of the books. Does not necessarily mean that this is what is meant in a different text book!!!
From p.286 The Cardiac Catheterization Handbook. 3rd Ed. Edited by Morton J. Kern. Mosby, St Louis 1999)