Development of the Peritoneum and Foregut Flashcards Preview

ESA 3 - Gastrointestinal System > Development of the Peritoneum and Foregut > Flashcards

Flashcards in Development of the Peritoneum and Foregut Deck (127)
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1

What kind of folding does the embryo undergo in the fourth week?

  • Lateral 
  • Craniocaudal 

 

2

What is the importance of lateral folding of the embryo?

  • Creates ventral body wall
  • Primitive gut becomes tubular 

3

Draw a diagram illustrating lateral folding of the embryo. 

Label the tubular primitive gut

4

What is the importance of craniocaudal folding of the embryo?

Creates cranial and caudal pockets from the yolk sac endoderm

5

What is the significance of the cranial and caudal pockets of the yolk sac endoderm?

It is the beginning of primitive gut development

6

Draw a diagram illustrating craniocaudal folding of the embryo

7

What is the primitive gut tube lined with?

Endoderm 

8

What regions is the primitive gut tube divisible into?

  • Foregut
  • Midgut
  • Hindgut

 

9

What is the importance of the divisions of the primitive gut tube?

They remain fundamental to the anatomy of the adult GI tract, and determine its nerve and blood supply

10

When does the development of the primitve gut tube begin?

In the 3rd week

11

What is the first step in the development of the primitive fut tube?

It 'pinches off' from the yolk sac cavity 

12

Where does the primitive gut tube run?

From the stomatodeum rostrally to the procotdeum caudally

13

What is the stomatodeum?

Future mouth

14

What is the proctodeum?

Future anusu 

15

Where does the primitive gut tube have an opening?

At the umbilicus

16

What is the opening at the umbilicus in the primitive gut tube called?

The vitelline duct 

17

Where does the vitelline duct lead to?

The yolk sac

18

Draw a diagram of the primitive gut tube 

19

What is the internal lining of the primitive gut tube derived from? 

The endoderm (future epithelial linings)

20

What is the external lining of the primitive gut tube derived from? 

Splanchnic mesoderm (future musculature, visceral peritoneum)

21

What is the primitive gut tube suspended in? 

Intraembryonic coelom 

22

What suspends the primitive gut tube in intraembryonic coelom? 

A double layer of splanchnic mesoderm 

23

What are the adult derivates of the foregut? 

  • Oesophagus 
  • Stomach
  • Pancreas
  • Liver
  • Gall bladder 
  • Duodenum (proximal to entrance of bile duct)

 

24

What is the blood supply to the foregut? 

Celiac trunk 

25

What are the adult derivatives of the midgut? 

  • Duodenum (distal to entrance of bile duct)
  • Jejenum 
  • Ileum 
  • Cecum 
  • Ascending colon
  • Proximal 2/3 transverse colon 

 

26

What is the blood supply of the midgut? 

  • Superior mesenteric artery (SMA)
  • Superior mesenteric vein 

 

27

What is the parasympathetic innervation of the midgut? 

Vagus nerve

28

What is the sympathetic innervation of the midgut? 

Superior mesenteric ganglion and plexus 

29

What are the adult derivatives of the hindgut? 

  • Distal 1/3 of transverse colon
  • Descending colon 
  • Sigmoid colon
  • Rectum 
  • Upper anal canal 
  • Internal lining of bladder and urethra 

 

30

What is the blood supply of the hindgut? 

  • Inferior mesenteric artery (IMA)
  • Inferior mesenteric vein (IMV)