Development of GI System Lecture Points Flashcards
a diverticulum in the foregut bifurcates to form …?
bronchial buds
name the 2 canals that run dorsally along pericardial and peritoneal cavities
pericardialperitoneal canals
what are the two divisions of lateral plate mesoderm?
somatopleuric mesoderm and splanchnopleuric mesoderm
which gut division goes on to form the allantois/bladder? (hint: it’s continuous)
hindgut
what surrounds viscera?
splanchnopleuric mesoderm
the primitive foregut (supplied by celiac artery) gives rise to the …
pharynx, esophagus, stomach, liver, gallbladder, and pancreas
the primitive midgut (supplied by superior mesenteric artery) gives rise to the ….
caudal portion of the duodenum, jejunum, ileum, ascending colon, cecum, and appendix
the primitive hindgut (supplied by inferior mesenteric artery) gives rise to the …
descending colon, rectum, anal canal, allantois, urogenital sinus
what fluid is the amniotic fluid primarily composed of?
urine made by kidneys
the chorionic cavity is attached to the amniotic cavity by what structure?
connective stalk
the peritoneal cavity is derived from what germ layer?
endoderm
which structure in GI development is not derived from endoderm?
spleen (mesoderm)
which gut division makes the intestinal loop?
midgut
which gut division makes the cloaca?
hindgut
after the left greater curvature of the stomach is rotated, it becomes the what …?
posterior vagal branch
what is the specific name of the dorsal mesentary surrounding the primitive stomach?
dorsomesogastrium
which gut division develops into the liver?
ventral foregut
how do you form an annular pancreas?
fusion of pancreatic diverticula; chokes off part of the gut tube causing stenosis and a cut leaflet
describe the first rotation of the intestines
LONGITUDINAL; 90 degrees CLOCKWISE rotation OUT
describe the second rotation of the intestines
180 degrees COUNTERCLOCKWISE rotation IN
where is “exuberant” growth occurring during intestinal development?
ileum and jejunum
what happens when the intestines don’t retract back in?
omphalocele
what happens when the vitelline duct persists in the connective stalk, forming an outpocketing of the ileum? may present similar to appendicitis
Merkel’s diverticulum
name the retroperitoneal viscera
esophagus and rectum
name the secondary retroperitoneal viscera
ascending/descending colon, pancreas, liver, duodenum
name the intraperitoneal viscera
stomach, gallbladder, transverse colon, jejunum, ileum, cecum, appendix, sigmoid colon
