Embryology

Question 1

When does the gut tube start developing?

Answer 1

29 days

Question 2

What two layers of germ line tissue does the gut develop from?

Answer 2

Endoderm and mesoderm

Question 3

Which tissue does the liver develop from?

Answer 3

Endoderm

Question 4

What cells does the endoderm include?

Answer 4

Mucosal epithelium, mucosal glands and submucosal glands

Question 5

What cells does the mesoderm include?

Answer 5

Lamina propria, smooth muscle, blood vessels and serosa

Question 6

What happens around days 35 - 39?

Answer 6

Gut and duodenum become distinguishable.
Ventral pancreatic bud starts to develop from the liver bud.
Dorsal pancreatic bud starts to develop from the duodenum. It is larger.

Question 7

What happens around days 40-55?

Answer 7

Liver begins to grow. Gall bladder and biliary ducts take shape.
Endoderm develops into branched tubules.
Islets of Langerhans form at duct branch, disconnect from duct.

Question 8

What happens around 6 weeks?

Answer 8

Primary rotation - duodenum C shape, ventral pancreas moves towards dorsal pancreas.

Question 9

What happens around day 56?

Answer 9

Pancreatic portions fuse, ventral pancreas becomes uncinate process.
Dorsal pancreatic duct fuses with common bile duct or remains attached to gut.
Ventral pancreatic duct attached to duodenum.