Key Takeaways
- Clinical Bottom Line
- The Gradient of Digestion
Clinical Bottom Line
| Gastric Zone | Primary Physiological Function | Clinical Relevance during EGD |
|---|---|---|
| Fundus / Body | Reservoir; secretion of Hydrochloric Acid (via parietal cells). | Primary site of variceal expansion (IGV1) and acid-secreting tumors. |
| Antrum / Pylorus | The “Grinder”; mechanical churning and Gastrin secretion. | Most frequent site for H. pylori colonization and gastric outlet obstructions. |
The Gradient of Digestion
The stomach is not a uniform bag; it is a highly stratified metabolic processor. The proximal fundus operates as a low-pressure, elastic reservoir designed to expand massively to accommodate food. Mechanically, this area is thin-walled and highly vascular, making it a high-risk zone for iatrogenic perforation during aggressive retroflexion maneuvers.
The Shift to Distal Motility
The distal antrum functions as the muscular engine. In patients with severe diabetic gastroparesis, this pumping mechanism fails entirely, leading to massive food retention and intractable vomiting despite a structurally normal pylorus. Modern 2026 interventions (like G-POEM) focus specifically on this distal zone, surgically disabling the pyloric resistance to allow the paralyzed antrum to empty via gravity into the duodenum, bypassing the failed mechanical grinder.
Clinical guidelines summarized by the Gastroscholar Research Team. Last updated: 2026. This article is intended for physicians.
