Lung formation

Question 1

week of lung bud development

Answer 1

4th

Question 2

tissue origin of lungs

Answer 2

endoderm
small diverticulum from the foregut at the level of future oesophagus
eventually endoderm just becomes inner lining

Question 3

what is shown in the L-R axis

Answer 3

asymmetry

Question 4

where do the lungs grow into

Answer 4

pleural cavities

Question 5

what occurs at day 28 to lungs

Answer 5

primary branching from the right and left primary bronchi

Question 6

what occurs at day 30 to lungs

Answer 6

secondary branching with 3 on right and 2 on left

Question 7

what does the secondary branching form

Answer 7

lobes of the lung, left side has to accommodate the heart

Question 8

later branching of the lungs

Answer 8

forms bronchopulmonary segments in week 6, then terminal bronchioles in week 10

Question 9

angles of either bronchi

Answer 9

steeper angle on left side, right side has more vertical bronchus

Question 10

tracheoesophageal fistula

Answer 10

connection between trachea and GI
defect in separation between the trachea and oesophagus
proximal blind-ended oesophagus with distal oesophagus attached much further below trache