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Flashcards in 010514 dev Deck (21):
1

what are precursors of the GI tract?

endoderm
splanchnic mesoderm
coelomic epithelium covering the splanchnic mesoderm (forms serosa)

2

which portion of the primitive stomach grows faster?

dorsal part grows faster and stomach rotates 90 deg clockwise

3

foregut extends to where?

duodenum (first and second parts)

4

midgut extends to where?

transverse colon (proximal 2/3)

5

what does the liver bud/diverticulum form?

two portions-cranial portion becomes liver and caudal portion becomes gallbladder

6

why does the midgut herniate?

because it has a very small area to grow in

7

what structure is the midgut connected to anteriorly?

yolk stalk or vitelline duct

8

duodenal atresia is

complete occlusion of the duodenum (as opposed to stenosis which is partial)

9

can duodenal atresia cause polyhydramnios?

yes

10

gastroschisis

defect in anterior abd wall
abdominal viscera exposed to amniotic fluid
it's not a hernia. it's not covered with membranes

11

omphalocele

herniation of abdominal viscera into proximal umbilicus (covered with membranes)

12

what kind of mesentery forms the greater omentum extending from the greater curvature?

the dorsal mesentery (due to stomach rotation)

13

what is the ventral mesentery of the stomach attached to?

the developing liver (the ventral mesentery is known as the lesser omentum)

14

the jxn btwn the foregut and midgut endoderm is proximal or distal to the bile duct?

distal to

15

what forms a ventral U shaped tube?

midgut as it elongates

16

the midgut loop has two limbs called

cranial and caudal limbs

17

what connects the cranial and caudal limbs of the midgut loop?

the vitelline duct, or also called yolk stalk

18

cloaca

terminal region of hindgut

19

what partitions the cloaca?

urorectal septum expansion

20

the liver, gallbladder, and biliary duct system develop from what?

ventral foregut endoderm

21

pancreas is formed how?

by fusion of ventral and dorsal pancreatic ducts