目的：观测食管胃连接部的形态、结构及食管壁肌层的形态和厚度的变化。
Objective:To observe the shape, structure and thickness of esophageal wall of the conjunct region between esophagus and stomach.
目的：观测食管胃连接部的形态、结构及食管壁肌层的形态和厚度的变化。
Objective:To observe the shape, structure and thickness of esophageal wall of the conjunct region between esophagus and stomach.
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