Esophagus and Lower Esophageal Sphincter Anatomy Diagram #91026 (License: Personal Use)

This labeled medical illustration shows the human esophagus extending from the pharynx to the stomach, with the lower esophageal sphincter (LES) marked at the gastroesophageal junction. The image clarifies how the LES functions as a muscular valve preventing gastric acid reflux, crucial for diagnosing conditions like GERD or achalasia. Rendered in clinical detail with clean labeling for educational use.

Used on health education pages, gastroenterology resources, patient handouts, and medical textbooks to explain upper digestive anatomy and disorders like acid reflux or esophageal motility issues. Matches user intent for learning about GI physiology or symptom causes.