FRANCOIS L'HOPITAL, ISM / SCIENCE PHOTO LIBRARY FRANCOIS L'HOPITAL, ISM / SCIENCE PHOTO LIBRARY
Pyloric sphincter of the stomach. Endoscope view of the pyloric sphincter (ring of muscle) and pyloric orifice (hole) that separates the stomach from the duodenum, the first part of the small intestine. Partially digested food (chyme) is passed through this orifice from the stomach.
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