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UKCDANA534 GI Dev

learning objectives for Digestive tract development

QuestionAnswer
Which of the 3 embryonic germ layers is responsible for forming the epithelial lining and glands of the GIT and respiratory system? Endoderm.
The developing gut tube can be divided into 3 regions. List them. Foregut, midgut, hindgut.
What are the GIT regions included in the Foregut? mouth through mid duodenum
What are the GIT regiosn included in the midgut ? mid duodenum through mid transverse colon
What are the GIT regions included in the hindgut? mid transverse colon through anus.
Organs covered by peritoneum and suspended in the peritoneal cavity are referred to as: Intraperitoneal.
Organs covered by peritoneum and held against the posterior abdominal wall are referred to as: Retroperitoneal.
The mesothelium lining the inside walls of the pleural and peritoneal cavity is referred to generically as: Parietal pleura/peritoneum.
The mesotheilium lining the outside walls of the viscera of the pleural and peritoneal cavities is referred to generically as: Visceral pleural/peritoneum.
Name the 3 abdominal vessels responsible for supplying blood from the dorsal aorta to the various regions of the fore-, mid- and hindgut. Celiac trunk; superior mesenteric a. and inferior mesenteric a. respectively.
Name the various divisions of the dorsal mesentery and the gut tube component that suspend from the dorsal wall of the embryo. Mesogastrium (stomach), mesoduodenum (duodenum), mesentery proper (jejunum/ileum), mesocolon (transverse and sigmoid colon).
Which accessory organ/gland of the gut tube develops first and how is it connected to the tube? Liver, connected via the bile duct
What structure(s) develops as an outpouching from the bile duct? Gallbladder and cystic duct.
From which outpouching(s) does the pancreas develop? Dorsal and ventral pancreatic buds.
List those parts of the pancreas arising from each outpouching: Dorsal pancreatic bud = head, neck, body and tail; ventral pancreatic outpouching = uncinate process.
Which part of the abdominal GIT develops fastest? The midgut.
What does the fast growing of the midgut result in? Herniation out of the embryo.
What happens as the midgut is retracted back into the embryo? The gut tube rotates 270 degrees counterclockwise as it retracts.
What is the vitelline duct and name one embryonic developmental anomally associated with it. The vitelline duct is a long narrow tube that connects the digestive tube with the yolk sac. It may persist in 2% of embryos as Meckel’s diverticulum - a patent connection of the lower ileum to the umbilicus.
Created by: wiechartm
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