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
Famous quotes containing the words upper and/or tract:
““All men live in suffering
I know as few can know,
Whether they take the upper road
Or stay content on the low....””
—William Butler Yeats (1865–1939)
“My only companions were the mice, which came to pick up the crumbs that had been left in those scraps of paper; still, as everywhere, pensioners on man, and not unwisely improving this elevated tract for their habitation. They nibbled what was for them; I nibbled what was for me.”
—Henry David Thoreau (1817–1862)