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Gastrointestinal System > Development Of The GI Tract > Flashcards

Development Of The GI Tract Flashcards

1
Q

What does folding of the embryo make?

A

Gut within a cavity

Anterior body wall

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2
Q

In the 4th week how does an embryo fold?

A

Laterally

Craniocaudally

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3
Q

What does folding laterally of the embryo cause?

A

creates ventral body wall

make primitive gut tube tubular

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4
Q

What does folding of the embryo craniocaudally cause?

A

creates cranial and caudal blind pockets from yolk sac ectoderm

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5
Q

What is endoderm?

A

Lined tube which runs the length of the body

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6
Q

Where does the gut tube have blind pouches?

A

At the head and tail

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7
Q

Where does the gut tube have an opening?

A

At the umbilicus

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8
Q

What is the covering of the gut tube?

A

Splanchnic mesoderm

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9
Q

What are the three divisions of the gut tube?

A

Foregut
Midgut
Hindgut

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10
Q

What does the foregut develop into?

A 
Oesophagus
Stomach
Pancreas
Liver
Gall bladder
1st part of the duodenum
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11
Q

What does the midgut develop into?

A 
2nd part of Duodenum 
Jejunum
Ilieum 
Cecums ascending colon
Proximal 2/3 of transverse colon
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12
Q

What does the hindgut develop into?

A 
Distal 1/3 of the transverse colon 
Descending colon
Sigmoid colon
Rectum 
Upper anal canal
Internal lining of the bladder and urethra
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13
Q

What is the blood supply of the foregut derivatives?

A

Celiac trunk

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14
Q

What is the blood supply for the midgut derivatives?

A

SMA

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15
Q

What is the blood supply for the hindgut derivatives?

A

IMA

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16
Q

Where does the blood supply for the gut tubes derivatives come from?

A

Abdominal aorta

17
Q

What happens to the blood supply if the derivative of the gut tube is in the mid and hind gut?

A

Has both blood supplies

18
Q

What is intraembryonic coelom?

A

Space formed as embryo folds

19
Q

What is the intraembryonic coelom subdivided by?

A

Diaphragm

20
Q

What is the intraembryonic coelom subdivided into?

A

Abdominal and thoracic cavities

21
Q

What does the membrane lining the intraembryonic coelom divide into?

A

Pericardium and pleural membrane

22
Q

What does the peritoneal cavity contain?

A

Only tiny amounts of fluid

23
Q

What is a mesentery?

A

Double layer of peritoneum suspended from the gut tube from the abdominal wall

24
Q

What does a mesentery allow?

A

A conduit for blood supply and mobility where needed

25
Q

How is the mesentery formed?

A

Primitive gut tube is suspended in the intraembryonic coelom, splanchnic mesoderm surrounds the new gut
Condensation of this forms the mesentery

26
Q

Where is dorsal mesentery?

A

Entire gut tube

27
Q

Where is ventral mesentery?

A

Foregut

28
Q

What is the foregut divided into?

A

Greater sac on the left
Lesser sac on the right
Divided by ventral and dorsal mesentery

29
Q

What is omenta?

A

Specialised regions of peritoneum

30
Q

What is the greater omentum?

A

Dorsal mesentery

First structure seen when opened anteriorly

31
Q

What is the lesser omentum?

A

Ventral mesentery, free edge conducts portal viad

32
Q

What does reteroperitoneal mean?

A

Not suspended in abdominal cavity

33
Q

What is secondary retroperitoneal?

A

Had a mesentery and was invested in peritoneum but after growth and development lost this

34
Q

Where is the foregut between?

A

The lung bud and the liver bud

35
Q

What does the respiratory diverticulum form?

A

In the ventral wall of the foregut at the pharyngeal gut junction

36
Q

Give two examples of retroperitoneal?

A

Pancreas

Duodenum

37
Q

What is fusion fascia?

A

Double connective tissue band from fusion of closely opposed surface of peritoneum

Gastrointestinal System (16 decks)

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