Embryology of the GI Tract Flashcards Preview

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Flashcards in Embryology of the GI Tract Deck (57)
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1

What happens by week 4

Endodermal tube running thought the centre of the emrbyo is present

2

What happens to the cloaca

develops into both parts of the urinary system and also for the hind gut

3

What are the 2 origins of the GI Tract

Endoderm and Visceral mesoderm

4

What does the endoderm form

Epithelium of mucosa and associated ducts and glands

5

What does the visceral mesoderm surround

Lamina propria
Muscularis mucosa and muscularis externa
CT of submucosa and External CT

6

What is the endoderm suspended in a bit of?

The mesoderm

7

What is the dorsal mesogastrium associated with?

Stomach, duodenum and mesentery proper (largest part of the dorsal mesentery associated with the small intestine

8

What happens to the dorsal mesogastrium

Moves downwards and forwards to become the greater omentum

9

How are the mesenteries brought into their final positions

Rotation of different parts of the gut

10

When is the oesophagus distringuishable by?

End of week 4

11

What develops in terms of the oesophagus in week 5

Circular muscle

12

What develops in terms of the oesophagus in week 8

Longitudinal muscle

13

What does the dilatation indicate at the end of week 4?

The stomach

14

How is the unusual shape of the stomach brought about

Swelling is not growing at a uniform rate - quicker on the left border. As it grows it starts to undergo a rotation

15

Where will the original left side of the stomach lie

Anteriorly

16

Where will the original right side of the stomach lie

Posteriorly

17

What also rotates at the same time as the stomach

Vagus nerves

18

Where does the greater curvature move

Slightly inferiorly pointing down

19

Where does the lesser curvature end up pointing

Slightly downwards

20

What forms the lesser sac

Growth and rotations of the stomach

21

What else does the growth and rotation of the stomach cause

The dorsal mesentery to bulge

22

What forms the greater omentum

Continued growth of the dorsal mesentery

23

What 2 things form from the ventral mesentery

Lesser omentum and falciform ligament

24

What 3 parts make up the duodenum and what do they make up

Caudal portion of foregut - parts 1 and 2 of duodenum
Cranial portion of midgut - parts 3 and 4 of duodenum
Duodenal loop is directed to the right due to the rotation of the stomach

25

Describe the growth of the liver bud

Into the mesoderm of the septum Transversum

26

What is the duodenum closely associated with

The liver, gall bladder and pancreas

27

What is important for the formation of the diaphragm

septum transversum

28

What is the gall bladder associated with

The posterior aspect of the liver

29

What does the mesoderm of septum transversum give rise to

The development of hepatocytes and the lining of the biliary tree

30

What does either side of the liver go on to be?

The lesser omentum

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