<prompt> The commonest anatomical position of appendix isRetrocaecalPelvicParacaecalPreileal  <response>: A. i.e. Retrocaecal- Vermiform appendix develops from midgut loops, is supplied by appendicular branch of ileocolic aery. It has mesoappendix mesentery but no teniaMost common posiion of vermiform appendix is retrocecal 12 oclock 65 followed by pelvic or 4 oclock positions 