Lateral Representation of the Posterior Wall of the Stomach

Description

Seen from the left lateral aspect, the stomach (gaster, ventriculus) is oriented with the fundus positioned superiorly beneath the left hemidiaphragm and the body tapering inferiorly toward the antrum and pyloric region. Emphasis falls on the posterior wall (facies posterior), which lies posterior to the lesser curvature and anterior to the omental bursa (lesser sac). Along its inferomedial margin, the gastric surface relates to the transverse mesocolon and the anterior layer of the greater omentum, while the upper posterior stomach approaches the bed of the stomach (splenic artery, left kidney, left suprarenal gland, pancreas). A key spatial idea is the pocket between stomach and pancreas. It is narrow. That posterior relationship matters in both teaching and operative planning because the posterior gastric wall forms the anterior boundary of the omental bursa, the route of access to the pancreas through the gastrocolic ligament. Posterior gastric ulcers can penetrate into the pancreas and may erode the splenic artery along the superior border of the pancreas, a mechanism for brisk upper gastrointestinal hemorrhage that differs from the more common anterior ulcer perforation into the greater sac. Laparoscopic posterior gastrotomy, cystogastrostomy, and drain placement for lesser sac collections all rely on a mental map of this lateral anatomy. Use this asset in gastrointestinal anatomy blocks, surgical atlases describing entry to the lesser sac, and clinical education materials on peptic ulcer complications and posterior gastric relations. It also pairs well with CT or endoscopic ultrasound teaching when correlating the gastric wall to the pancreas and peripancreatic spaces. Anatomical accuracy verified by SciePro's Medical Advisory Board.