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Dorsal mesentery: Mesentery proper: Small intestine (jejunum and ileum) Posterior abdominal wall: Superior mesenteric artery, accompanying veins, autonomic nerve plexuses, lymphatics, 100–200 lymph nodes and connective tissue with fat Transverse mesocolon: Transverse colon: Posterior abdominal wall: Middle colic: Sigmoid mesocolon: Sigmoid ...
The mesentery of the small intestine arises from the root of the mesentery (or mesenteric root) and is the part connected with the structures in front of the vertebral column. The root is narrow, about 15 cm long, 20 cm in width, and is directed obliquely from the duodenojejunal flexure at the left side of the second lumbar vertebra to the ...
The primitive mesentery of a six weeks’ human embryo, half schematic. (Lesser omentum labeled at left.) Schematic and enlarged cross-section through the body of a human embryo in the region of the mesogastrium, at end of third month
The gastrointestinal tract (GI tract, digestive tract, alimentary canal) is the tract or passageway of the digestive system that leads from the mouth to the anus.The GI tract contains all the major organs of the digestive system, in humans and other animals, including the esophagus, stomach, and intestines.
The ventral mesentery forms the lesser omentum, and is attached to the developing liver. In the adult, these connective structures of omentum and mesentery form the peritoneum , and act as an insulating and protective layer while also supplying organs with blood and lymph vessels as well as nerves. [ 29 ]
During the gestation phase which takes place at week 4, the dorsal bud develops from the dorsal mesentery, and form the body and tail of the pancreas. Meanwhile, the ventral bud arises inferior to form the head of the pancreas. [1] Two weeks later, the ventral bud will rotate dorsally and fuse with the dorsal bud to form the pancreas.
The peritoneum surrounds the uterus like a flat sheet that folds over its fundus, covering it anteriorly and posteriorly; on the sides of the uterus, this sheet of peritoneum comes in direct contact with itself, forming the double layer of peritoneum known as the broad ligament of the uterus.
In zoology, a mesentery is a membrane inside the body cavity of an animal. The term identifies different structures in different phyla : in vertebrates it is a double fold of the peritoneum enclosing the intestines; in other organisms it forms complete or incomplete partitions of the body cavity, whether that is the coelom or, as in the ...