Embryology

Question 1

germ layer of trachea and lung

Answer 1

endoderm

Question 2

precursor to lower respiratory tract, which week

Answer 2

anterior diverticulum (blind pouch) of the GI tract, branches off pharynx

week 4

Question 3

progression of lower respiratory tract

Answer 3

cranial to caudal, alveoli last

Question 4

what does the fetus “breathe”

Answer 4

amniotic fluid

Question 5

timeline for alveolar development

Answer 5

primitive thick walled develop in week 22, surfactant by week 24
-gradually get thinner

continue to develop till 7 yo

Question 6

cause of infant respiratory distress syndrome

Answer 6

deficient surfactant, can happen w/ premature birth

Question 7

describe tracheoesophageal fistula

Answer 7

abnormal opening b/w trachea and esophagus

Question 8

timeline for fistula

Answer 8

4-7 weeks

Question 9

utero and post birth Sx of fistula

Answer 9

utero: polyhydramnios

after birth: choking, coughing, cyanosis, vomiting

Question 10

define atelectasis

Answer 10

collapsed alveoli