Embryology of the GI Flashcards

1
Q

Part of which embryological structure becomes the gut tube?

A

Yolk sac

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2
Q

During which weeks does organogenesis take place?

A

Weeks 3-8

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3
Q

What constitutes the foregut?

A

Oesophagus
Stomach
Duodenum at the entrance of the bile duct

Pancreas, liver and gallbladder also form in the foregut

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4
Q

What is the beginning and end of the midgut?

A
Duodenum after entrance of bile duct
Jejunum
Ileum
Caecum
Proximal 2/3 colon
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5
Q

What constitutes the hindgut?

A
Distal 1/3 of the colon
Splenic flexture
Descending colon
Sigmoid colon
Rectum
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6
Q

Which structures are formed from the lateral plate mesoderm?

A

Visceral and parietal layers of the peritoneum

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7
Q

What name is given to the area behind the stomach?

A

Omental bursa

Lesser sac

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8
Q

What other name is given to the abdominal cavity (in front of stomach)?

A

Greater sac

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9
Q

Through which structure do the greater and lesser sac communicate?

A

Epiploic foramen

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10
Q

What ligament carries the umbilical vein?

A

Falciform ligament

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11
Q

What 2 things must happen for the midgut to reach adult pattern?

A

Rotation

Herniation

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12
Q

When does herniation of the midgut occur?

A

Week 6

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13
Q

What is Meckel’s diverticulum?

A

A bulge protruding from the umbilical cord occuring when the vitelline duct is not fully absorbed by the fetus in the 7th week of pregnancy

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14
Q

Which artery supplies the foregut?

A

Coeliac artery

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15
Q

Which artery supplies the midgut?

A

Superior mesenteric artery

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16
Q

Which artery supplies the hindgut?

A

Inferior mesenteric artery

17
Q

What structures form from the ectoderm?

A
CNS
PNS
Skin
Sensory epithelia of eye, nose, pituitary, mammary and sweat glands
Adrenal medulla
18
Q

When does a tracheo-oesophageal fistula occur?

A

If the tracheo-oesophageal septum deviates incorrectly

19
Q

What is an annucular pancreas?

A

Ventral bud fails to migrate around the duodenum correctly

May cause duodenal stenosis

20
Q

What is an omphalocoele?

A

Herniation of intestinal loop through an enlarged umbilical ring

21
Q

What are some malformations occurring in the hindgut?

A

Urorectal fistula
Rectovaginal fistula
Anorectal atresia
Imperforate anus