Table 1.

Stages of mouse and human lung development

Stage	Mouse Gestational Age, days	Human Gestational Age, wk
Embryonic	E9-11.5	3–7
Pseudoglandular	E11.5-16.5	5–17
Canalicular	E16.5-17.5	16–26
Saccular	E17.5-PN5	24–38
Alveolar	PN5-28	32 wk–8 yr PN*

E, embryonic; PN, postnatal.

^*Most of the alveolar multiplication ceases by 2-3 yr of PN age. From Refs. 37, 46, 52–54, 80.