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
