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Fig. 1. Median-sagittal section through tip of lung-bud of a 20 somite chick

Median-sagittal section (10 micron in thickness) through tip of lung-bud of a 20-somite chick, 40 hours' incubation haematoxylin and eosin stain, series B.

Angioblasts, forerunners of pulmonary system, are seen proliferating from and near dorsal endothelial wall of sinus venosus. They extend dorsally toward the ventral surface of the gut, which shows a slight ventral swelling - the primary lung rudiment. This is about the earliest stage in which there is any evidence of the formation of a pulmonary vascular system.

1922 Chicken Pulmonary: Fig 1 | Fig 2 | Fig 3 | Fig 4 | Fig 5 | Fig 6 | Fig 7 | Fig 8 | Fig 9 | Fig 10 | Plate 1 | Plate 2 | Carnegie No.66 | Chicken Development | Respiratory

Links: Carnegie Institution of Washington - Contributions to Embryology | Chicken Development | Respiratory System Development

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