GI dev Flashcards
When does stomach rotation occur
week 4-6
when does gut rotation and umbilical herniation occur
week 6
when do intestinal loops return?
week 10
dis membrane
buccopharyngeal
dis duct
vitelline duct
deez
allantois and cloacal membrane
GI tract embryonic derivative
endoderm
muslce of viscera and connectiev tissue embryonci derivative
lateral plate mesoderm
Four parts of gut
pharyngeal, fore, mid, hind
Foregut
Esophagus
– Stomach
– Proximal duodenum
– Liver and Gallbladder
– Pancreas
– (Spleen)
Innervation of ventral and dorsal stomach
anterior and posterior vagus nerve
Celiac artery is blood supply to…
foregut
superior mesenteric artery supplies blood to
mid gut
what innervates the stomach?
CN X
Stomach
rotates….
Clockwise
• 90 degrees
• Week 4 – 6
• Posterior side
enlarges
Pancreas forms from how many buds and what kind
two endodermal buds which teh ventral bud moves dorsally
Ventral bud of pancreas
Uncinate process
– Main pancreatic duct
Dorsal bud
Accessory pancreatic
duct
– (prox. main
pancreatic duct)
Liver Development comes from
hepatic diverticulum
hepatic diverticulum goes into…
hepatoc cords, then liver, gallbladder, cystic duct, ventral pancreas
midgut
Distal duodenum
– Jejunum
– Ileum
– Cecum
– Appendix
– Ascending colon
– Hepatic flexure
– Proximal 2/3 transverse colon
Primary intestinal loops occurs in the…
midgut.
Primary intestinal loop rotates around axis formed
by the superior mesenteric artery.
– The rotation is in a counterclockwise rotation to
approximately 270 degrees when complete.
– The gut herniates into the umbilical cord at week 6
(90° CCW), returns to abdominal cavity at week 10
(180°CCW).
Hindgut is
Distal 1/3 transverse colon
– Splenic flexure
– Descending colon
– Sigmoid colon
– Rectum
– Upper anal canal
Cloaca =
expanded caudal
portion of the
hindgut
Cloaca is divided by the
urorectal septum
the urorectal septum into
rectum (dorsal) and urogenital sinus (ventral)
Anus divides into
Upper anal canal
• hindgut (endoderm)
Lower anal canal
• ectoderm
Junction between the
two parts of anus
pectinate line
what is different at the pectinate line?
innervation, lymphatic drainage,
