Neo and Peds 1| 145 QUESTIONS| WITH COMPLETE SOLUTIONS

What are the 5 stages of human lung development? correct answer: embryonal, pseudoglandular, canalicular, saccular, alveolar When is the embryonal phase? correct answer: first two months of gestation The lungs begin to emerge as a bud from the pharynx _______ after conception correct answer: 26 days What develops during the embryonal phase? correct answer: trachea, pulmonary tree, major airways, and diaphragm What errors can occur during the embryonal phase? correct answer: laryngeal, tracheal, or esophageal atresia, or stenosis When is the pseudoglandular phase? correct answer: extends to week 16 of gestation During this phase, -the conducting airways continue to develop -subdivision of the conducting airways system begins -terminal bronchioles begin to form at the most distal end -cilia begin to appear on the surface of the epithelium of the trachea and mainstem bronchi correct answer: pseudoglandular phase Cartilage may be present in 10-14 airway generations at __________. correct answer: 24 weeks gestation At the end of this stage, airways, arteries, and veins have developed in the pattern corresponding to that found in an adult correct answer: pseudoglandular phase What error can develop in the pseudoglandular phase? correct answer: pulmonary hypoplasia (incomplete development of the lungs) In this phase, -vascular channels/capillaries begin to form -the capillary network begins to form around the airway passages -surfactant begins to develop -respiratory bronchiole, alveolar ducts, and alveolar sacs begin to form correct answer: canalicular phase What cannot occur until the capillaries have sufficient surface area and are