BPK 375 Lecture Notes - Lecture 12: Infant Respiratory Distress Syndrome, Ductus Arteriosus, Bronchiole
24 Nov 2016
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Bpk 375 week 12 lecture: growth & development of the respiratory &cardiovascular. In utero, gas transport is facilitated through the placenta and umbilical cord. At birth, there is a transition to functioning of the lungs. The level of lung development is one of the factors that determines if a premature- born infant survives. The formation of the respiratory system begins at four months of gestation. The cranial part divides into the laryngotracheal tube and the esophagus. The larynx develops from the endodermal lining of the laryngotracheal tube, and the surrounding mesenchyme from the fourth and sixth pairs of branchial arches. Primitive connective tissue mesenchyme is pluripotent in that it is the precursor to many tissues including cartilage, bone, and muscle. The lungs develop as a bud from the caudal end of the laryngotracheal tube. This branches into the bronchial buds, secondary bronchi, and tertiary bronchi via dichotomous branching. Respiratory bronchioles are present by the 24th week when 17.
