Upper Gastrointestinal Tract
The upper gastrointestinal tract consists of the esophagus, stomach, and duodenum. The exact demarcation between "upper" and "lower" can vary. Upon gross dissection, the duodenum may appear to be a unified organ, but it is often divided into two parts based upon function, arterial supply, or embryology.
Read more about this topic: Human Gastrointestinal Tract
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