Development Of Gut (1)

Question 1

What process forms the trilaminar disc?

Answer 1

Gastrulation

Question 2

What are the 3 layers of the trilaminar disc?

Answer 2

Ectoderm
Mesoderm
Ectoderm

Question 3

What are the 3 sections of the mesoderm?

Answer 3

Paraxial mesoderm
Intermediate mesoderm
Lateral plate mesoderm

Question 4

What does the paraxial mesoderm give rise to?

Answer 4

Somites

Question 5

What do somites form?

Answer 5

Vertebrae
Skeletal muscles
Cartilage
Tendons

Question 6

What does the intermediate mesoderm give rise to?

Answer 6

Kidneys

Gonads

Question 7

What 2 types of mesoderm does the lateral plate mesoderm form?

Answer 7

Somatic mesoderm

Splanchnic mesoderm

Question 8

What 2 types of mesoderm does the lateral plate mesoderm form?

Answer 8

Somatic mesoderm

Splanchnic mesoderm

Question 9

What does the splanchnic mesoderm form?

Answer 9

Viscera

Question 10

What does the somatic mesoderm form?

Answer 10

Associated with body walls

Question 11

What does the ectodermal give rise to?

Answer 11

Epidermis of skin
Hair
Nails
CNS
PNS

Question 12

What does the endoderm give rise to?

Answer 12

Forms epithelial lining of GI tract

Question 13

What 2 planes does the trilaminar disc fold in?

Answer 13

Sagittal folding
Lateral folding

Question 14

Describe the Sagittal folding of the trilaminar disc:

Answer 14

Cranio-caudal folding occurs creating a head and tail end of the embryo

Question 15

What forms the amniotic cavity? (look at slide 5)

Answer 15

Somatic lateral plate of mesoderm surrounds the ectoderm

Question 16

What forms the yolk sac? (look at slide 5)

Answer 16

Endoderm surrounded by the splanchnic lateral plate mesoderm

Question 17

What are the 3 parts that the endoderm differentiates into?

Answer 17

Foregut
Midgut
Hindgut

Question 18

What does the foregut form?

Answer 18

Oesophagus to the 2nd part of the duodenum where the bileduct and pancreas join

Question 19

Where does the midgut span to?

Answer 19

From the 2nd part of the duodenum to the distal 2/3rds of the transverse colon

Question 20

Where does the hindgut span to?

Answer 20

Distal 2/3 transverse colon to upper anal canal

Question 21

What is a blind ended diverticula? where are they found?

Answer 21

No opening where the mouth and anus form

Question 22

What is the connection between the midgut and the yolk sac called?

Answer 22

Vitelline duct

Question 23

What can happen if the vitellin duct doesn’t obliterate at birth?

What is the condition called?

Answer 23

There’s a connection between midgut and umbilicus meaning faecal maternal can come out the umbilicus

Meckels diverticulum

Question 24

What is the intraembryonic coelom?

Answer 24

The space between the splanchnic mesoderm and the somatic mesoderm

Question 25

What does the intraembryonic coelom give rise to?

Answer 25

Thoracic cavities
Abdominal cavities

Question 26

What is the splanchnopleuric mesoderm?

What does it form?

Answer 26

It’s derived from lateral plate mesoderm

Splanchnic mesoderm + endoderm

Forms viscera

Question 27

What is somatopleuric mesoderm?

What does it form?

Answer 27

Derived from lateral plate mesoderm

Somatic mesoderm + ectoderm

Body walls + dermis

Question 28

What is peritoneum (serous membrane lining abdominal cavity) derived from?

Answer 28

Lateral plate mesoderm

Question 29

What part of the lateral plate mesoderm forms the parietal peritoneum?

Answer 29

Somatic portion of lateral plate mesoderm

Question 30

What part of the lateral plate mesoderm forms the visceral peritoneum?

Answer 30

Splanchnic portion or lateral plate