2/29/2024 0 Comments Apex dead space lung![]() Acinar contents develop mainly during the canalicular and saccular stages. 1All preacinar (conducting) airways will develop by week 17 which is the end of the pseudoglandular stage. The alveoli continue to proliferate until 300 million (32 m 2) have formed, usually by age 8. The human lung develops through multiple stages during gestation: the embryonic, pseudoglandular, canalicular, saccular, and alveolar. ![]() These buds continue to elongate forming the primary and segmental bronchi. By day 28, the bulge has formed into the right and left lung buds. 1 , 2 , 3 , 4The tracheobronchial tree develops between days 24 to 36 of gestation during which a median bulge develops on the ventral wall of the pharynx at the laryngotracheal groove ( Fig. ![]() The epithelium of the trachea, bronchi, and alveoli originate from the endoderm, and the muscle, cartilage, and connective tissue originate from the mesoderm. During weeks 3 to 4 of gestation, the respiratory system develops from the ventral wall of the foregut. ![]()
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