The elements of Embryology (1889) The elements of Embryology elementsofembryo00fostuoft Year: 1889 VI.] THE LUNGS. 177 and larynx, while the two diverticula behind (Fig. 60, Ig) become the bronchial tubes and lungs. While the above changes are taking place in the h}^oblastic walls of the alimentary tract, the splanchnic Fig. 62. Four Diagrams illustrating the Formation of the Lungs. (After Gotte.) a. mesoblast; b. hypoblast; d. cavity of digestive canal; I. cavity of the pulmonary diverticulum. In (1) the digestive canal has commenced to be constricted into a dorsal and ventral canal; the
The elements of Embryology (1889) The elements of Embryology elementsofembryo00fostuoft Year: 1889 VI.] THE LUNGS. 177 and larynx, while the two diverticula behind (Fig. 60, Ig) become the bronchial tubes and lungs. While the above changes are taking place in the h}^oblastic walls of the alimentary tract, the splanchnic Fig. 62. Four Diagrams illustrating the Formation of the Lungs. (After Gotte.) a. mesoblast; b. hypoblast; d. cavity of digestive canal; I. cavity of the pulmonary diverticulum. In (1) the digestive canal has commenced to be constricted into a dorsal and ventral canal; the former the true alimentary canal, the latter the pulmonary tube ; the two tubes communi- cate with each other in the centre. In (2) the ventral (pulmonary) tube has become expanded. In (3) the expanded portion of the tube has become con- stricted into two tubes, still communicating with each other and with the digestive canal. In (4) these are completely separated from each other and from the digestive canal, and the mesoblast has also begun to exhibit externally changes corresponding to the internal changes which have been going on. F. &B. 12
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