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The jejunum is the second part of the small intestine in humans and most higher vertebrates, including mammals, reptiles, and birds. Its lining is specialized for the absorption by enterocytes of small nutrient molecules which have been previously digested by enzymes in the duodenum .
Brain at the U.S. National Library of Medicine Medical Subject Headings (MeSH) (view tree for regions of the brain) BrainMaps.org; BrainInfo (University of Washington) "Brain Anatomy and How the Brain Works". Johns Hopkins Medicine. 14 July 2021. "Brain Map". Queensland Health. 12 July 2022.
Image of the human brain showing sulci, gyri, and fundi shown in a Coronal section. Specific terms are used to represent the gross anatomy of the brain: A gyrus is an outward folding of the brain, for example the precentral gyrus. A sulcus is an inward fold, or valley in the brain's surface - for example the central sulcus. Additional terms ...
The human brain is the central organ of the nervous system, and with the spinal cord, comprises the central nervous system. It consists of the cerebrum, the brainstem and the cerebellum. The brain controls most of the activities of the body, processing, integrating, and coordinating the information it receives from the sensory nervous system ...
The next branch from the abdominal aorta is the superior mesenteric artery, which supplies the regions of the digestive tract derived from the midgut, which includes the distal 2/3 of the duodenum, jejunum, ileum, cecum, appendix, ascending colon, and the proximal 2/3 of the transverse colon.
Two variants of jejunoileal anastomosis were developed, the end-to-side [1] and end-to end [2] anastomoses of the proximal jejunum to distal ileum.In both instances an extensive length of small intestine was bypassed, not excised, excluding it from the alimentary stream.
The jejunal arteries are four-five branches of the superior mesenteric artery [1] which supply blood to the jejunum. [ citation needed ] They arise from the left side of the superior mesenteric artery.
This forms the beginning of the jejunum. [3] The duodenojejunal flexure is surrounded by the suspensory muscle of the duodenum . [ 4 ] : 274 It is retroperitoneal , so is less mobile than the jejunum that comes after it, helping to stabilise the jejunum.