The z-line is the transition between the esophageal mucosal tissue with squamous cell epithelium and the gastric mucosal tissue with columnar cell epithelium, presented as a clear contrast of the mucosal colors.
The z-line is the transition between the esophageal mucosal tissue with columnar cell epithelium and the gastric mucosal tissue with squamous cell epithelium, presented as a clear contrast of the mucosal colors.
The z-line is normally located at the 2nd constriction of the esophagus