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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 ...
Dorsal mesentery, of the jejunal and ileal loops, forms the mesentery proper. [6] The ventral mesentery, located in the region of the terminal part of the esophagus, the stomach and the upper part of the duodenum, is derived from the septum transversum.
Two of the stages in the development of the digestive tube and its mesentery. The arrow indicates the entrance to the bursa omentalis. The greater omentum develops from the dorsal mesentery that connects the stomach to the posterior abdominal wall. During its development, the stomach undergoes its first 90° rotation along the axis of the ...
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 ...
Its two attachments are commonly referred to as the dorsal mesogastrium and the ventral mesogastrium. As the stomach rotates during early development, the dorsal and ventral mesentery rotate with it; this rotation produces a space anterior to the expanding stomach called the greater sac, and a space posterior to the stomach called the lesser sac.
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 ]
forms a dorsal layer associated with ectoderm, the somatopleuric mesoderm. This forms the body wall lining and dermis. Abdominal portion becomes contained in dorsal mesentery, part of the serosal mesoderm. When the two layers form, a cardiogenic plate is visible.
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