Development Of The GI Tract

Question 1

What does folding of the embryo make?

Answer 1

Gut within a cavity

Anterior body wall

Question 2

In the 4th week how does an embryo fold?

Answer 2

Laterally

Craniocaudally

Question 3

What does folding laterally of the embryo cause?

Answer 3

creates ventral body wall

make primitive gut tube tubular

Question 4

What does folding of the embryo craniocaudally cause?

Answer 4

creates cranial and caudal blind pockets from yolk sac ectoderm

Question 5

What is endoderm?

Answer 5

Lined tube which runs the length of the body

Question 6

Where does the gut tube have blind pouches?

Answer 6

At the head and tail

Question 7

Where does the gut tube have an opening?

Answer 7

At the umbilicus

Question 8

What is the covering of the gut tube?

Answer 8

Splanchnic mesoderm

Question 9

What are the three divisions of the gut tube?

Answer 9

Foregut
Midgut
Hindgut

Question 10

What does the foregut develop into?

Answer 10

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

Question 11

What does the midgut develop into?

Answer 11

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

Question 12

What does the hindgut develop into?

Answer 12

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

Question 13

What is the blood supply of the foregut derivatives?

Answer 13

Celiac trunk

Question 14

What is the blood supply for the midgut derivatives?

Answer 14

SMA

Question 15

What is the blood supply for the hindgut derivatives?

Answer 15

IMA

Question 16

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

Answer 16

Abdominal aorta

Question 17

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

Answer 17

Has both blood supplies

Question 18

What is intraembryonic coelom?

Answer 18

Space formed as embryo folds

Question 19

What is the intraembryonic coelom subdivided by?

Answer 19

Diaphragm

Question 20

What is the intraembryonic coelom subdivided into?

Answer 20

Abdominal and thoracic cavities

Question 21

What does the membrane lining the intraembryonic coelom divide into?

Answer 21

Pericardium and pleural membrane

Question 22

What does the peritoneal cavity contain?

Answer 22

Only tiny amounts of fluid

Question 23

What is a mesentery?

Answer 23

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

Question 24

What does a mesentery allow?

Answer 24

A conduit for blood supply and mobility where needed

Question 25

How is the mesentery formed?

Answer 25

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

Question 26

Where is dorsal mesentery?

Answer 26

Entire gut tube

Question 27

Where is ventral mesentery?

Answer 27

Foregut

Question 28

What is the foregut divided into?

Answer 28

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

Question 29

What is omenta?

Answer 29

Specialised regions of peritoneum

Question 30

What is the greater omentum?

Answer 30

Dorsal mesentery | First structure seen when opened anteriorly

Question 31

What is the lesser omentum?

Answer 31

Ventral mesentery, free edge conducts portal viad

Question 32

What does reteroperitoneal mean?

Answer 32

Not suspended in abdominal cavity

Question 33

What is secondary retroperitoneal?

Answer 33

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

Question 34

Where is the foregut between?

Answer 34

The lung bud and the liver bud

Question 35

What does the respiratory diverticulum form?

Answer 35

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

Question 36

Give two examples of retroperitoneal?

Answer 36

Pancreas | Duodenum

Question 37

What is fusion fascia?

Answer 37

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