Which fold of GIT is NOT permanent:
Ruga are the mucosal folds present in the stomach which disappear on distension, hence are not permanent. Plicae semilunaris/circulares are circular folds of mucous membrane and are permanent (not obliterated by distension).
Ruga
Plicae semilunaris
Spiral Valve of Heister
Transverse rectal
Stomach and aerial supply of abdomen