A system of obstetrics . Fig. 129.—(From Balfour, after Gotte.) Diagrams illustratingthe Origin of the Lungs: a, mesoblastof oesophageal portion of splanchnopleure ; 6, hypoblast; cl, cavity of alimentary canal; I,cavity of pulmonary diverticulum. In 1 the fore-gut has begun to divide into dorsal andventral tubes; the dorsal becomes the pharynx or gullet; the ventral, the larynx andtrachea. In 2, the laryngotracheal tube has become expanded laterally. In 3, it is shownas subdividing into two tubes communicating with one another and with the alimentarycanal. In 4 the subdivision is completed po
A system of obstetrics . Fig. 129.—(From Balfour, after Gotte.) Diagrams illustratingthe Origin of the Lungs: a, mesoblastof oesophageal portion of splanchnopleure ; 6, hypoblast; cl, cavity of alimentary canal; I,cavity of pulmonary diverticulum. In 1 the fore-gut has begun to divide into dorsal andventral tubes; the dorsal becomes the pharynx or gullet; the ventral, the larynx andtrachea. In 2, the laryngotracheal tube has become expanded laterally. In 3, it is shownas subdividing into two tubes communicating with one another and with the alimentarycanal. In 4 the subdivision is completed posteriorly, and the cross-section shows thebronchi quite separate from one another and from the fore-gut. Fig. 130.—(From Landois.) k, mesoblast of splanchnopleure ; I, hypoblast; m, stomach ; s, lowerpart of oesophagus; t, windpipe; b, e, bronchi; /, commencing bronchial tubes and pulmo-nary air-cells. agus; a cross-section at this stage is somewhat hour-glass in form, asrepresented at 1. The dorsal widening of the h
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectobstetrics, bookyear1
