right gastric vein right gastric vein the right gastric vein (pyloric vein) drains blood from the lesser curvature of the stomach into the hepatic portal vein. it is part of the portal circulation. right gastric veinthe portal vein and its tributaries (right gastric vein visible but not labeled)detailsdrains fromlesser curvature of the stomachdrains tohepatic portal veinarteryright gastric arteryidentifierslatinvena gastrica dextrata98a12.3.12.016ta25111fma15400anatomical terminology structure the right gastric vein passes right along the lesser curvature of the stomach to the pylorus. once there, it joins onto the portal vein before the duodenum. the prepyloric vein is the last connecting branch onto the right gastric vein, marking the end of the stomach, and draining the proximal part of the duodenum. function the right gastric vein drains deoxygenated blood from the lesser curvature of the stomach.