Embryology of GI tract Flashcards
The epithelium of the mucosa in the GI tract develops from the _ (germ layer)
Endoderm
The lamina propria of the mucosa develops from the _
Visceral mesoderm
Both the muscularis mucosa & muscularis externa develop from the _
Visceral mesoderm
Associated ducts and glands of the GI tract develop in the _
Endoderm
Emrbryological Mesenteries of the gut can be divided into ventral and dorsal. What are the two Ventral mesentries of the gut?
- Falciform ligament 2. Lesser omentum
What are the 3 dorsal mesenteries of the gut?
- Dorsal mesogastrium 2. Dorsal mesoduodenum 3. Dorsal mesocolon
The rotation of different parts of the gut bring the mesenteries into their final positions. T/F?
True
What are the important changes that take place in the stomach?
- Dilation of caudal part of foregut
- Dorsal border grows rapidly- greater & lesser curvature forms
- 90 degree rotation taks
Growth and rotation of the stomach causes the formation of the _ sac
Lesser
Continued growth of the dorsal mesentery leads to the _
Greater omentum
Parts 1 & 2 of the duodenum are formed from the _ portion of the foregut
Caudal
Parts 3 & 4 of the duodenum are formed from the cranial part of the _
Midgut
Liver bud grows into the mesoderm of _ _
Septum Transversum
Rotation of the pancreas does not take place during its development. T/F?
False- does
The spleen is an endoderm derivative. T/F?
False- mesoderm
Which part of the gut stays in communicaiton with the yolk sac throughout much of its development?
Midgut
Connection between the midgut and the yolk salk is via which duct?
Vitelline duct
The appendix sprouts from the _
Caecum
During re-entry of the abdominal structures into the body cavity, the _ and _ colon are displaced left, the _ is pushed right and the _ colon is pushed superiorly
- Jejunum & descending colon
- Ileum
- transverse
What 3 defects can occur in the vitelline duct?
- Vitelline fistula
- V cyst
- V ligament
