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  2. Duodenum - Wikipedia

    en.wikipedia.org/wiki/Duodenum

    The first part of the duodenum is the most common location of ulcers since it is where the acidic chyme meets the duodenal mucosa before mixing with the alkaline secretions of the duodenum. [24] Duodenal ulcers may cause recurrent abdominal pain and dyspepsia , and are often investigated using a urea breath test to test for the bacteria, and ...

  3. Retroperitoneal space - Wikipedia

    en.wikipedia.org/wiki/Retroperitoneal_space

    Ascending and descending colon; Duodenum; Posterior pararenal space. Bounded by the posterior leaf of the renal fascia and the muscles of the posterior abdominal wall. It contains only fat ("pararenal fat" also known as "pararenal fat body", "paranephric body", or "paranephric fat").

  4. Quadrants and regions of abdomen - Wikipedia

    en.wikipedia.org/wiki/Quadrants_and_regions_of...

    The left lower quadrant includes the left iliac fossa and half of the flank. The equivalent in other animals is left posterior quadrant. The left upper quadrant extends from the umbilical plane to the left ribcage. This is the left anterior quadrant in other animals. The right upper quadrant extends from umbilical plane to the right ribcage.

  5. Small intestine - Wikipedia

    en.wikipedia.org/wiki/Small_intestine

    The small intestine supports the body's immune system. [20] The presence of gut flora appears to contribute positively to the host's immune system. Peyer's patches, located within the ileum of the small intestine, are an important part of the digestive tract's local immune system. They are part of the lymphatic system, and provide a site for ...

  6. Descending colon - Wikipedia

    en.wikipedia.org/wiki/Descending_colon

    The descending colon extends from the left colic flexure [2]: 1194 at the upper left part of the abdomen inferior-ward through the left hypochondrium and lumbar regions, along the outer border of the left kidney, [citation needed] ending at the level of the iliac crest [2]: 1194 at the lower left part of the abdomen, [citation needed] being ...

  7. Human digestive system - Wikipedia

    en.wikipedia.org/wiki/Human_digestive_system

    The lower gastrointestinal tract (GI), includes the small intestine and all of the large intestine. [29] The intestine is also called the bowel or the gut. The lower GI starts at the pyloric sphincter of the stomach and finishes at the anus. The small intestine is subdivided into the duodenum, the jejunum and the ileum. The cecum marks the ...

  8. Gastrointestinal tract - Wikipedia

    en.wikipedia.org/wiki/Gastrointestinal_tract

    The lower gastrointestinal tract includes most of the small intestine and all of the large intestine. [15] In human anatomy , the intestine ( bowel or gut ; Greek: éntera ) is the segment of the gastrointestinal tract extending from the pyloric sphincter of the stomach to the anus and as in other mammals, consists of two segments: the small ...

  9. Major duodenal papilla - Wikipedia

    en.wikipedia.org/wiki/Major_duodenal_papilla

    The major duodenal papilla is situated in the second part of the duodenum, 7–10 cm from the pylorus, at the level of the second or third lumbar vertebrae. It is surrounded by the sphincter of Oddi , a circular muscle, and receives a mixture of pancreatic enzymes and bile from the Ampulla of Vater , which drains both the pancreatic duct and ...