Embryology

Question 1

Describe early respiratory system development

Answer 1

.Formation of trachea and bronchi
.Lung development
.Formation of pleural cavities
.Diaphragm development

Question 2

What week does the heart/liver start developing?

Answer 2

Week 4

Question 3

Developing of the trachea - oesophagotracheal ridges fuse to form oesophagotracheal septum during what week?

Answer 3

Week 4

Question 4

The laryngotracheal tube splits into what?

Answer 4

larynx and trachea

Question 5

What does the respiratory diverticulum/lung bud go into?

Answer 5

The lungs (bronchi)

Question 6

What are the two layers of the layrngotracheal tube?

Answer 6

Splanchnic mesoderm - gives rise to cartilage, connective tissue and muscles.
Endoderm - gives rise to epithelium and glands of trachea and pulmonary epithelium.

Question 7

List the stages of lung maturation

Answer 7

.Pseudoglandular stage
.Canalicular period
.Terminal sac period
.Alveolar period

Question 8

When is the pseudoglandular stage? And what happens in it

Answer 8

(5-16weeks)
.Terminal bronchioles form 
.All major compartments form except for gas exchange 
.5 wks: primary bronchi 
.6 wks: branching

Question 9

Pericardioperitoneal canals are initially connected to what in the pleural cavity?

Answer 9

Pericardial and peritoneal cavities. This develops in conjunction with the pseudoglandular stage

Question 10

What seperates the pericardioperitoneal canals and the pericardial cavity?

Answer 10

Pleuropericardial folds