The three main arteries supplying the stomach are the:
Common hepatic artery - Its branches supply the greater and lesser curvature.
Splenic artery - It supplies the posterior stomach wall, fundus and the greater curvature.
Left gastric artery - Its branches participate in the supply of the upper part of the lesser curvature.
They all arise from the coeliac trunk, a branch of the abdominal aorta.
Celiac trunk - ventral view