[Embryonic development of the human duodenum].
Epithelial duodenal anlage takes place at the end of the first month of the human embryogenesis in connection with appearance of the pancreatic epithelial germs. It has a form of a short arch with a spindle-like enlargement of the middle ductal part. Formation of the hepato-duodenal ligament and of the duodenal mesentery results in appearance of the given organ anlage with a three-layered wall in 5.5-6-week-old embryos. The anlage makes an arch, protruding to the right and forward with a spindle-like enlargement of the middle ductal part. It is tightly connected with the forming anlage of the pancreatic head, when the pancreatic epithelial anlages are fusing. An intensive growth of the pancreatic head is accompanied with emergence and enlargement of the superior, descending and inferior parts of the duodenum, that acquires a semicircular form in 8-8.5-week-old embryos. Its transitional stage is a curved semicircle having a form of a distended spiral coil; that reflects an uneven growth of the organ in the human embryogenesis.
D004386:Duodenum / Q000196:embryology*; D006801:Humans; D008643:Mesentery / Q000196:embryology; D010179:Pancreas / Q000196:embryology
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