title: Alveolar development in the human fetus and infant.
abstract: The lungs from 29 infants aged from 29 weeks of gestation to 18 weeks postnatal age were studied using morphometric analysis; total DNA was estimated in 12 of these. Alveoli could first be counted and measured at 29 weeks gestation; with increasing age they became more mature in appearance as the walls elongated and thinned, and they gradually increased in diameter. Lung volume increased 4-fold between 29 weeks and term, and further doubled in the 4 months after birth. Lung volume, alveolar surface area and DNA all increased linearly with age and weight. Alveolar number showed a curvilinear increase with age and DNA, but a linear relationship to body weight. At birth the lungs had an average of 150 million alveoli, half of the expected adult number. There was a wide normal range. The surface area was between 3 and 5 m2 at birth, one twentieth of the adult value.
mesh_terms: D001835:Body Weight; D004247:DNA / Q000032:analysis; D005260:Female; D005865:Gestational Age; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008168:Lung / Q000032:analysis / Q000196:embryology; D008297:Male; D011650:Pulmonary Alveoli / Q000196:embryology* / Q000254:growth & development
chemical_list: D004247:DNA