鶏気嚢に関する基礎的研究 : I 鶏胚子期における気嚢の発育

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Macroscopic and histologic studies were carried out on the air sacs of over 200 embryos in this experiment. The lungs were observed in the 3rd day of artificial incubation. The primary bronchi developed on the 4th day, and secondary bronchi gave rise to many tertiary bronchi by the 7th day of artificial incubation. A primary bronchus entered each lung on its medial side at the junction of its anterior and middle thirds, more or less at right angles to the lung. Immediately after its poit of entry it branched into four large dorsal secondary bronchi. Each secondary bronchus was connected to several tertiary bronchi which occupy a definite region of the lung, although there were many interconnections between these tertiary bronchi. Some of these secondary bronchi were connected directly to air sacs. The second posterior ventral secondary bronchus terminated in the posterior thoracic sac, and was the only secondary bronchus of the posterior group in direct connection with an air sac. Some air sacs were paired while others were single midline structures, although these developed in the embryo as paired sacs until the 15th to 16th day of artificial incubation. Some had extentions into pneumatic bones and others had extentions in the form of subsidiary sacs. The air sacs were very thin-walled structures, with poor blood supply, all of which were connected to tertiary bronchi in the lungs. It appears that the structure of air sacs might develop more completely after hatching.
帯広畜産大学の論文
1977-01-17

鶏気嚢に関する基礎的研究 : I 鶏胚子期における気嚢の発育

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