The American journal of anatomy . how the lateral and mesial moieties of the interclavicu-lar sac and the connections of air-sacs with the l)ronchial tree. Figure 21, a latero-mesial view, shows the relative dimensionsof the lung and its air-sacs on the twelfth day of development,There are four well marked indentations of the ribs. The trunksof recurrent bronchi are indicated as developing from the abdomi-nal and posterior intermediate air-sacs, and also from a smallaccessory sac between them. This accessory sac is apparentlycut off from the posterior intermediate and our observations in-cline
The American journal of anatomy . how the lateral and mesial moieties of the interclavicu-lar sac and the connections of air-sacs with the l)ronchial tree. Figure 21, a latero-mesial view, shows the relative dimensionsof the lung and its air-sacs on the twelfth day of development,There are four well marked indentations of the ribs. The trunksof recurrent bronchi are indicated as developing from the abdomi-nal and posterior intermediate air-sacs, and also from a smallaccessory sac between them. This accessory sac is apparentlycut off from the posterior intermediate and our observations in-cline us to the belief that in this specimen it is connected withthe fourth laterobronchus. Schulze (11) has called attentionto it (and its recurrent bronchi) as commonly present in Ciconia, THE EMBRYOLOGY OF THE BIRD S LUNG 471 Dissoiira and other birds and also as occurring infrequently inthe chick. At the base of the recurrent bronchi of the posteriorintermediate and of the accessory sac is an enlargement or pocket Fig. 21 Latero-mesial view of the left lung and air-sacs of an embryo of twelvedays incutation. The air-sacs exhibited include the lateral and mesial moietiesof the interclavicular and an accessory sac between the posterior intermediate andthe abdominal sacs. Recurrent bronchi from the posterior three sacs are bronchi are present on the anterior intermediate and lateral moiety ofthe interclavicular but hidden from view. (Basaltasche), which Schulze has pointed out as a characteristicstructure at the base of the reciuTent bronchi of the differentair-sacs. THE AMERICAN JOURNAL OF ANATOMY, VOL. 19, NO. 3 472 WILLIAM A. LOCY AND OLOF LARSELL The connection between the anterior intermediate and the me-sial moiety of the interclavicuhir sac is well exhibited. The fork(shown in other figures) on the distal end of the mesial moietyis not visible owing to the position in which the specimen isviewed. It curves around the main bronchus away from th
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1910, booksubjectanatomy
