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Flashcards in Development of the GIT Deck (32)
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1

How prevalent is Meckel's diverticulum?

2% of the population

2

Where is Meckel's diverticulum located?

2 feet from the ileocaecal valve

3

How long is a Meckel's diverticulum?

2 inches (5cm) long

4

What is a Meckel's diverticulum?

A remnant of the vitello-intestinal duct that extends from the mid gut to the yolk sac

5

When is the vitello-intestinal duct expected to close?

9th week of gestation

6

When do people usually present with Meckel's diverticulum?

2 years of age

7

What kind of ectopic tissue might be found in a Meckels diverticulum?

Pancreatic and gastric mucosa

8

What is the innervation for the foregut?

T5-T9

9

What is the blood supply to foregut?

Coeliac artery

10

What forms the serosal layer of the GIT?

Splanchnic lateral plate of the mesoderm

11

Which part of the duodenum is contained within the foregut?

The first 2 parts

12

Which part of the duodenum within the midgut?

The second 2 parts

13

Which structures compose the foregut?

Oesophagus and 1st 2 parts of duodenum
Liver
Pancreas
Gallbladder
Spleen

14

What is the innervation of the midgut?

T10-T11

15

What is the blood supply to the midgut?

Superior mesenteric artery

16

What is the midgut composed of?

Last 2 sections of the duodenum, jejunum, caecum, ascending colon, proximal 2/3 of transverse colon

17

How does the stomach rotate during embryology?

It rotates 90 degrees clockwise

18

When does the midgut retract into the abdominal cavity?

During the 10th week of development

19

How much does the intestines rotate during embryonic development?

240 degrees anti-clockwise

20

When does the midgut herniate out of the abdominal cavity?

During 6th week of development

21

Define an omphalocoele

Indirect herniation of the intestines via the umbilicus, the intestines are surrounded by a layer of amnion and this condition is often associated with chromosomal abnormalities

22

Define gastroschisis

Direct herniation of the intestines through the abdominal wall. The intestines are not covered in amnion and therefore can be damaged by amniotic fluid and the condition is not associated with chromosomal abnormalities

23

Which type of gut herniation is associated with chromosomal abnormalities?

Omphalocoele

24

Which type of gut herniation results in intestines being damaged by the amniotic fluid?

Gastroschisis

25

What does the hindgut consist of?

Distal 1/3 of the transverse colon, descending colon, sigmoid colon, rectum, and 1st half of the anal canal

26

What is the blood supply to the hindgut?

Inferior mesenteric artery

27

What is innervation of the hindgut?

T12-L1

28

Which embryological structure gives rise to the myenteric plexus?

Ectodermal neural crest cells

29

What is the function of Ladds Bands?

Attach caecum to RLQ retroperitoneum

30

How might Ladd's Bands be affected in intestinal malrotation?

Malrotation can lead to Ladds bands attaching the caecum the RUQ leading to intestinal obstruction