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NWHSU Embryology Respiratory Development

Another name for the ventral endodermal envagination that forms the larynx, trachea, bronchi, and lungs. laryngotracheal groove
What gives rise to the epithelium and glands of the trachea. Endodermal lining
True or false? Paranasal sinuses are formed when bones are excavated. True
True or false? Surfactant is produced at seven months of fetal development. True
What is a lack of surfactant production called? hyaline membrane disease
True or false? By the time the lung reaches adult maturity, a total of 17 generations of subdivisions form the bronchial tree. False 23 subdivisions (17 prenatally, 6 postnatally)
True or false? Ectopic lung lobes arise from the trachea or esophagus? True (Langman's p207)
True or false? At birth, the tracheal bifurcation lies at T4. True
True or false? Only about 1/6th of the adult alveoli are present at birth. True
True or false? The laryngotracheal groove develops from the pharyngeal floor of the foregut during the 4th week of development. True
True or false? Endoderm gives rise to the epithelium, not the connective tissue fo the larynx, bronchi, and lungs. True
True or false? In a tracheoesophageal fistula, there is usually an additional fibrous cord attached to the larynx. False (Langman's p202)
True or false? The oronasal membrane lies just behind the secondary palate. False (primary palate)
True or false? The primitive choanae are located behind the primary palate. True
What forms the CT, cartilage, smooth muscle, and vessels of the respiratory system? splanchnic mesenchyme
Where does the tracheal bifurcation go postnatally? T4-T5
The laryngotracheal diverticulum maintains connection with the pharynx through what? laryngeal orifice
What are congenital cysts of the lung and how do they form? Cystic structure of the lung with poor drainage and cause chronic infection. They are formed by dilation of terminal or larger bronchi.
How do tracheoesophageal fistulas form? They are the results of either spontaneous posterior deviation of the tracheoesophageal septum or from some mechanical factor pushing the dorsal wall of the foregut anteriorly.
Within the primitive pleural cavities, what forms the visceral pleura? Splanchnic mesoderm
Within the primitive pleural cavities, what forms the parietal pleura? Somatic mesoderm
Lung buds and bronchi grow laterally from the laryngotracheal diverticulum and penetrate the _____. Pericardioperitoneal canals

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