Gastrointestinal System Essay

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The Gastrointestinal System The gastrointestinal tract is a collection of organs that work together to enable the body to digest and absorb numerous substances. It is often described as a long muscular tube starting at the mouth, and ending at the anus. The esophagus, stomach, small intestine (consisting of the duodenum, jejunum, and the ileum), and the large intestine (consisting of the cecum, ascending, transverse, and descending colon, the sigmoid, rectum, and anus), all make up the gastrointestinal tract. The esophagus is the starting point for the gastrointestinal tract, it is a muscular tube that measures approximately twenty-five centimeters from the pharynx to the stomach. It passes through the diaphragm, and has two curvatures which …show more content…
It is divided into three parts: the fundus, the body, and the antrum. The fundus is the largest, most superior portion of the stomach. The body is between the fundus and the antrum. The antrum leads to the pylorus, which connects the stomach to the duodenum (the first part of the small intestine). The stomach also has a lesser and a greater curvature. The greater curvature is covered by peritoneum and attaches to the greater omentum. The lesser curvature forms the right border of the stomach. The small intestine is the next organ involved in the gastrointestinal tract. The first part of the small intestine is known as the duodenum and it is divided into four sections based upon where they bend and course throughout the body. For example, the second part of the duodenum is where the pancreatic head sits and the Duct of Wirsung enters the ampulla of …show more content…
The duodenum then connects to the jejunum at the duodenoljejunal junction, and the jejunum begins at the ligament of Treitz. The jejunum occupies about two fifths of the small intestine and has a wider and thicker wall than the ileum. The ileum is the longest section of the small intestine, measuring approximately thirteen feet. It extends from the jejunum to the ileo-cecal valve where the small intestine joins the large intestine. The large intestine (colon) is about five feet, and measures four to nine millimeters thick un-distended. The cecum is the first part of the large intestine and has the appendix attached to its inferior portion. The appendix is located in the right lower quadrant of the abdomen and measure eight to ten centimeters in length, six millimeters in diameter, and two millimeters in wall thickness. From the cecum, the colon courses superior which is known as the ascending colon, which in turn, becomes the transverse colon, and finally the colon returns inferior as the descending colon and slightly courses medial as the sigmoid colon. The rectum leads into the anus. The anus then exits to the outside of the body, thus

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