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[The pre- and postnatal development of the human lung]
1Disciplina de Anatomie, Facultatea de Farmacie, Universitatea de Medicină şi Farmacie Gr. T. Popa, Iaşi.
Insights
Bronchoalveolar structure development during fetal growth depends on prenatal maturity. Research suggests a dual embryonic origin for these structures, with implications for understanding lung abnormalities.
Area of Science:
- Embryology
- Pulmonary Medicine
- Histology
Context:
- Intrauterine lung development is complex and influenced by factors like prenatal maturity.
- Understanding the origins of bronchoalveolar structures is crucial for diagnosing congenital lung abnormalities.
Purpose:
- To investigate the intrauterine evolution of bronchoalveolar structures using histological sections and pulmonary radiographs.
- To analyze bronchial growth patterns and their relationship with prenatal maturity.
- To evaluate the embryonic origins of the bronchial and alveolar components.
Summary:
- Bronchoalveolar structures were studied during fetal development, revealing non-uniform bronchial growth, particularly in the lower lobes.
- The study supports a dual embryonic origin: endothelial for bronchial epithelium and mesenchymal for the respiratory system.
- Prenatal immaturity or dismaturity significantly impacts lung development.
Impact:
- Provides insights into the normal development of the human lung, aiding in the identification of developmental abnormalities.
- Contributes to the understanding of congenital pulmonary conditions by elucidating the embryological basis of lung structures.
- Highlights the importance of considering dual embryonic origins in cases of pulmonary malformations.
Abstract:
The bronchoalveolar structures where studied during the intrauterine evolution by histological sections and pulmonary radiographs. This evolution depends on the degree of "prenatal immaturity" or "dismaturity". I compared my results with data from literature. I estimated the rate of bronchial growth as being not uniform, the most abundant branches being encountered in the basic layers of the inferior lobes, and some peripheral juxta-pleural bronchial bend in right angles, continuing with branches parallel to the pleural surface. I find justified the opinion, increasingly sustained by authors, that the epithelium of the bronchial conduction system has an endothelial origin, while the breathing device originates from the mesenchyme dressing the bronchial distal extremities. However, some pathological aspects, or pulmonary congenital abnormalities, make me sustain this double embryonal origin of the bronchoalveolar structures.