Template:Lung stage table

From Embryology
Human Lung Stages
Stage Human Features
Embryonic week 4 to 5 lung buds originate as an outgrowth from the ventral wall of the foregut where lobar division occurs
Pseudoglandular week 5 to 17 conducting epithelial tubes surrounded by thick mesenchyme are formed, extensive airway branching
Canalicular week 16 to 25 bronchioles are produced, increasing number of capillaries in close contact with cuboidal epithelium and the beginning of alveolar epithelium development
Saccular week 24 to 40 alveolar ducts and air sacs are developed
Alveolar late fetal to 8 years secondary septation occurs, marked increase of the number and size of capillaries and alveoli
Links: Species Stage Comparison | respiratory