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The junction between the stomach and duodenum is a narrowed opening surrounded by a smooth muscle sphincter, called the pyloric sphincter. The lumen of the pyloric sphincter is called the pyloric canal. It opens into the duodenum through the pyloric orifice [probe passes through the orifice and into the duodenum].
Links and References:
Grant's: 2.28, 2.30
Netter: 260
Rohen/Yokochi: 276
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