Openings of Abomasum

1 Cardiac opening 2 Rumino-Reticulo opening : joins the rumen with reticulum, guarded ventrally by "rumino-reticular fold" 3 Reticulo-omasal opening 4 Omaso-Abumasal opening : flanked by a fold know as "Omasal vela" 5 Pyloric opening : between abomasum and duodenum, at which the torus pylorus is found