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GI > Embryology > Flashcards

Embryology Flashcards

1
Q

Blood supply of foregut?

A

Celiac trunk

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2
Q

Blood supply of mid gut?

A

Superior mesenteric artery, abdominal aorta

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3
Q

Blood supply of hindgut?

A

Inferior mesenteric artery

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4
Q

Derivatives of foregut?

A

Oesophagus, stomach, duodenum (proximal to the entrance of the bile duct), liver, gall bladder, pancreas

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5
Q

Adult derivatives of midgut?

A

Duodenum, jejenum, ileum, ascending colon, caecum, proximal 2/3 transverse colon.

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6
Q

Adult derivatives of hindgut?

A

Distal 2/3 transverse colon, descending colon, sigmoid colon, rectum, upper anal canal, internal lining of bladder and urethra.

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7
Q

Blood supply of pancreas?

A

Celiac trunk AND superior mesenteric artery

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8
Q

Blood supply of duodenum?

A 
Celiac trunk (prox to bile duct entrance)
SMA (distal to bile duct entrance)
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9
Q

What does the intra-embryonic coelom become?

A

Divided into thoracic and abdominal cavities by the diaphragm

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10
Q

Where is dorsal mesentery present? Where is ventral present?

A

Dorsal is present in all fore mid and hind gut areas. Ventral is present only in the foregut region.

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11
Q

What is secondary retroperitoneal?

A

Structures that began invested with peritoneum but with more growth lose it by fusing to posterior abdominal wall

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12
Q

What is the greater omentum formed from?

A

Dorsal mesentery

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13
Q

What is the lesser omentum formed from?

A

Ventral mesentery

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14
Q

Where is the greater omentum present?

A

Hangs from the greater curvature of the stomach

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15
Q

Where is the lesser omentum?

A

Runs from liver to the lesser curvature of the stomach

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16
Q

At what stage does the tracheosophageal septum form?

A

Around 4 weeks. Begins as a respiratory diverticulum

17
Q

Where on the abdominal wall does Gastroschisis present?

A

As a vertical defect to the right of the umbilicus

18
Q

Where on abdominal wall does exampholos/omphalocoele present?

A

At umbilicus

19
Q

At whats stage does physiological herniation occur?

A

6th week

20
Q

What is the innervation of the midgut?

A

Parasymp: vagus nerve
Symp: superior mesenteric ganglion & plexuses

21
Q

What is the innervation of the hindgut?

A

Parasymp: pelvic S2,3,4
Symp: inferior mesenteric ganglion & plexuses

22
Q

What does the cloaca divide into at the 6th week?

A

Anterior- urogenital sinus

Posterior- anorectal canal

23
Q

What does the urorectal sinus grow down towards? What is it?

A

The proctodeum (anal pit). Layer of ectoderm and endoderm (no mesoderm)

24
Q

What is the epithelium present above the pectinate line?

A

Columnar

25
Q

What is the epithelium present below the pectinate line?

A

Stratified squamous

GI (2 decks)

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