Digestive Development Flashcards
What derives both the dorsal and ventral mesentery?
Splanchnic mesoderm
Where does the midgut start?
just after the major duodenal papilla; Just after the entrance of pancreatic and bile ducts
In which direction foes the stomach rotate in development?
90 deg clockwise from a superior view
What causes the formation of the omental bursa/lesser sac?
The rotation of the stomach (hence why the lesser sac is located beneath the stomach
The inferior portion of the head and uncinate process of the pancreas are formed from what?
The ventral bud
What is the axis for rotation for all midgut rotation?
The SMA
At what point is there a physiological umbilical herniation and what occurs?
In weeks 6-10 the midgut grows too fast for the abdominal cavity to contain so the intestinal loops enter the extraembryonic cavity in the umb cord
Which are the only segments of the LI that are retroperitoneal?
The ascending and descending colons
When do occlusion and recanalization of the midgut occur?
Occlusion during the 6th week, recanalization in the 9th
In the anal canal, the superior 2/3 is derived from what?
Endoderm of hindgut
In the anal canal, the inferior 1/3 is derived from what?
Ectoderm
What is the junction between the endodermal and ectodermal regions of the anal canal?
The pectinate line
