Formation Of Body Cavities (EMB)

Question 1

What are the three phases of embryonic development?

Answer 1

Growth, Morphogenesis, and differentiation

Question 2

When does folding of the embryo begin?

Answer 2

4th week

Question 3

What plane does head and tail folding occur?

Answer 3

Median plane

Question 4

What does the septum transversum become? What is it innervated by?

Answer 4

The future diaphragm

C3, 4, 5 (keep you alive)

Question 5

What does the tail fold overgrow in the embryo?

Answer 5

The cloaca and connecting stalk

Question 6

What is the splanchnopleura?

Answer 6

The splanchnic layer of the lateral plate mesoderm and the endoderm making up the yolk sack adjacent

Question 7

What is the somatopleura?

Answer 7

It is made up of somatic lateral plate mesoderm and ectoderm surrounding the amniotic cavity

Question 8

What features are found in Ectopia Cordis?

Answer 8

The heart forms outside the body without a pericardium and with a bifid sternum

Results in death for many, and can be seen with ultrasound

Question 9

What do the somatic and splanchnic layers give rise to?

Answer 9

Parietal and Visceral structures, respectively

Question 10

What are pleuropericardial folds and from what do they arise from?

Answer 10

They are membranes that separate the pleural cavity from the peritoneal cavity

it comes from the somatic layer of the lateral plate mesoderm

Question 11

What does the septum transversum fuse with to contact the posterior body wall?

Answer 11

It fuses with the pleuralperitoneal folds, which then becomes the diaphragm and definitively closing off the peritoneal cavity