As the endoscope is advanced, the lumen is kept in view. A gentle upward deflection of the tip helps the endoscope hug the lesser curvature.
With the patient in the left lateral decubitus position, the endoscopist facing the patient, and the scope relaxed as described in the text, entry into the stomach will generally give a view oriented with the lesser curvature at 12 o’clock, the greater cu
A. The endoscope is advanced down the relatively straight esophagus until the lower esophageal sphincter is identified. B. The lower esophageal sphincter often coincides with the transition from squamous epithelium (white) of the esophagus to mucosa (pink
The esophageal opening is recognized as a simple slit at the base of the triangle formed by the glottis, just behind the arytenoid cartileges. The two piriform sinuses lie on each side of the esophageal opening.