Abstract
The small intestine extends from the distal end of the pyloric canal to the ileocaecal junction and consists of the duodenum, jejunum, and ileum. The jejunum and ileum (collectively often termed the small bowel) are attached to the posterior abdominal wall by a mesentery and their loops are mobile. The mesentery of the small intestine begins at the duodenojejunal flexure to the left of the lower border of the first lumbar vertebra and passes obliquely downwards to the right sacroiliac joint. It contains the superior mesenteric vessels, the lymph nodes draining the small bowel and autonomic nerve fibres. Its surface projection is an oblique line from a point just to the left of the lower border of the first lumbar vertebra (in the transpyloric plane) towards the right iliac fossa.
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Standring, S. (2019). The Anatomy of the Small Intestine. In: Parker, M., Hohenberger, W. (eds) Lower Gastrointestinal Tract Surgery: Vol.1, Laparoscopic procedures. Springer Surgery Atlas Series. Springer, Cham. https://doi.org/10.1007/978-3-030-05240-9_1
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