Sectional Anatomy of the Male Stomach

Description

Sectional planes progress through the adult male upper gastrointestinal tract, tracing the distal esophagus as it enters the gastric cardia just inferior to the diaphragm, then sweeping across the fundus, gastric body, and antrum toward the pylorus. As the cut surface advances, the mucosa and its rugae (gastric folds) come into and out of profile, with the submucosa and muscularis externa forming a thicker, layered gastric wall posterior to the lesser curvature and more expansile along the greater curvature. The pyloric sphincter appears as a circumferential thickening at the gastroduodenal junction, positioned inferior and slightly rightward relative to the gastric body, creating a clear luminal transition into the proximal duodenum. Landmarks stay easy to track. Radiologists and gastroenterologists rely on these relationships when correlating axial CT, MRI, and fluoroscopic studies with endoscopic findings, because the same lesion can look different depending on whether you cut through rugae, a distended lumen, or a contracted antrum. An animated sectional sequence clarifies why the pylorus can mimic a mass when the circular muscle is in spasm and why focal mucosal irregularity along the lesser curvature raises concern for peptic ulcer disease or early gastric carcinoma, while diffuse fold thickening can suggest gastritis, portal hypertensive gastropathy, or linitis plastica. Seeing the cardia-to-pylorus continuity in motion also helps orient students to the common radiographic pitfall of mistaking the fundus for an adjacent air-filled structure when the stomach is partially collapsed. Use it for teaching cross-sectional anatomy in medical gross anatomy, radiographic anatomy, and GI modules, and for figure support in review articles on pyloric pathology, upper GI bleeding, and staging of gastric tumors on CT. It also fits patient-facing explainers that compare endoscopy views with sectional imaging. Anatomical accuracy verified by SciePro's Medical Advisory Board.