[The anlage of the duodenal lymphatic bed: morphogenetic prerequisites, structure and importance]

The anlage of the duodenal lymphatic bed takes place on the 3d month of the human intrauterine life. In the intestinal villi there are chyle sinuses, that fuse into presumptive lymphatic vessels, having capillary structure, when they get out of the villi. Intraorganic vessels turn into extraorganic ones, they flow into the pancreatoduodenal lymphatic vessels. In their lumens stromal anlage of the lymphatic nodes are formed as a result of invagination of the blood vessels. Development of the lymphatic bed in the duodenum preceded with formation of intestinal villi (this contributes to absorption of the intestinal content) and deformity of the superior mesenteric vein (this probably makes difficult the organ's drainage). The situation is solved owing to the lymphatic bed anlage. It is, evidently, formed by means of switching off a part of embryonal veins from the blood stream.