Lung Development Flashcards
The appearance of the ________ is the earliest indication of lung bud formation
laryngo-tracheal groove and tube
What gives rise to the larynx?
Most cranial portion of the laryngo-tacheal tube and the surrounding mesoderm
What are the epithelium and glands of the trachea derived from?
endoderm
What are the cartilage, connective tissue, and muscle surrounding the trachea derived from?
splanchnic mesoderm
What gives rise to the visceral pleura?
splanchnic mesoderm
What gives rise to the parietal pleura?
somatic mesoderm from body wall
In what lung development period do the lung buds resemble exocrine glands of cuboidal epithelium,
all elements are present by the end except repiratory surfaces
survival is not possible during this stage
pseudoglandular (5 - 17 weeks)
What lung development period
vascularization takes place
respiratory bronchioles develop by the end
canalicular period 16 - 25 weeks
What lung development period
respiratory epithelium matures
surfactant is present
terminal sacs develop
terminal sac period 24 weeks - 30
What is the lung development period?
alveoli form from terminal sacs
alveolar 30 - birth
What percent of alveoli are present at birth?
12 - 15%
Agenesis?
absence or failure to form
Fistula?
abnormal passage or connection between two internal organs
atresia
closure
stenosis
narrowing
