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. 2022 Sep 10;50(3):285–310. doi: 10.1007/s10396-022-01236-0

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© The Author(s) 2022, corrected publication 2023

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Fig. 9 — Pyloric ring and duodenal bulb From the sagittal plane of the antrum (gray arrow heads), moving parallel to the right, the probe is rotated about 30 ° counterclockwise to identify the pyloric ring; continuing along the wall reveals the duodenal bulb. The muscularis propria is the thickest in the pyloric ring due to the pyloric sphincter (arrow). The duodenal wall is thinner than the gastric wall (white arrowhead)