Abstract
During the ontogenesis of Homo Sapiens there are two systems for the gas exchanges that incites towards the study of the anatomic characteristics of ecoton areas, that is transition areas between adjacent biocenosis. The microanatomic analysis of placental hemochorial and pulmonary alveolar-blood biologic barriers was carried out on 9 fetus-placenta systems with gestational age between 16 and 26 weeks and on 3 embryos of 7 weeks of gestation. The comparative study of these two biological barriers involved in das exchange, offered arguments for understanding the morphogen synergisms from the perspective of their structural synchronism. The authors consider that at the base of their morphogenesis, stand the reciprocal induction and interrelations between epithelium and mesenchyme that generate structures adapted to gas exchange between different environments: blood-blood antepartum and air-blood postpartum. K ey Words: morphogen synergism, respiratory biologic barrier, placental villi, pulmonary alveoli.
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