Embryology

Question 1

What does the endoderm form

Answer 1

Lining of trachea and bronchial tree

Question 2

What does the visceral mesoderm form

Answer 2

Lung tissues apart from lining

Question 3

Lung bud development (2)

Answer 3

Forms from foregut so trachea and oesophagus is formed

One tube splits into two

Question 4

Congestinal defects (2)

Answer 4

Oesophageal atresia

Tracheoesophageal fistula

Question 5

Oesophageal atresia (2)

Answer 5

Blind ending

Oesophagus splits, fuses to and is blocked by trachea

Question 6

Tracheoesophageal fistula (2)

Answer 6

Communication

Oesophagus forms hole into trachea

Question 7

Stages of Lung maturation (5)

Answer 7

Embryonic
Pseudoglandular
Canalicular
Saccular
Alveolar

Question 8

Embryonic stage (3)

Answer 8

From 26 days to 6 weeks
Respiratory diverticulum forms
Branching gives lungs, lobes and segments

Question 9

Pseudoglandular stage (2)

Answer 9

From 6 - 16 weeks

14 generations of branching forming terminal bronchioles

Question 10

Canalicular stage (2)

Answer 10

From 16 - 28 weeks

Respiratory bronchioles and alveolar ducts form

Question 11

Saccular stage (3)

Answer 11

From 28-36 weeks
Terminal sacs form
Capillaries establish close contact

Question 12

Alveolar stage (2)

Answer 12

Form 36 weeks to early childhood

Alveoli mature