The American journal of anatomy . ic stages (with theexception of a figure by Selenka, 66) the mesial moiety has notbeen represented. It is commonly hidden from view betweenthe two lungs. There are however some published sketches ofsection of the lungs, as Lillie, 08, Juillet, 12, etc., in which ithas been represented as a forward projecting diverticulum ofthe anterior intermediate air-sac, but in these sections it hasheretofore been interpreted as a portion of the anterior inter-mediate sac. Also in a diagram of Juillet, 12, (cf. his fig. X, ) the mesial moiety of the lung of the embryon
The American journal of anatomy . ic stages (with theexception of a figure by Selenka, 66) the mesial moiety has notbeen represented. It is commonly hidden from view betweenthe two lungs. There are however some published sketches ofsection of the lungs, as Lillie, 08, Juillet, 12, etc., in which ithas been represented as a forward projecting diverticulum ofthe anterior intermediate air-sac, but in these sections it hasheretofore been interpreted as a portion of the anterior inter-mediate sac. Also in a diagram of Juillet, 12, (cf. his fig. X, ) the mesial moiety of the lung of the embryonic chick isrepresented to the exclusion of the lateral moiety. In the genusLarus, even in the adult, a separate lateral sac of the interclavicu-lar is present in addition to the mesial portion of that sac (Juilletsfig. XVII, p. 351). For the further history of these moieties ofthe interclavicular air-sac see figures 47, 49, 50 and 52 and theaccompanying comments. THE EMBRYOLOGY OF THE BIRD S LUNG 467 Fig. 17 Camera tracing of the cai)illary network on the dorsolateral surfaceof the left lung of an embryo at the close of the eighth day of incubation. Drawnby Mary Head. Fig. 18 Surface view of the hmgs of an embryo at the close of the ninth dayof development. Right bronchus cut and lung rotated so as to expose the mesialsurface. , abdominal air-sac; ^., anterior intermediate air-sac, withprimordiaof recurrent bronchi () •., Cervical air-sac; , lat-eral moiety and Ulcsjuoi., mesial moiety of the interclavicular air-sac; ,posterior intermediate air-sac. 468 WILLIAM A. LOCY AND OLOF LARSELL The obvious external feature of the tenth day is the indenta-tion of the ribs on the dorso-lateral border of the lungs. Figure19 shows a dissection exposing the right lung and adjacent or-gans of an embryo at the beginning of the eleventh day. Thereare four well marked indentations of the ribs. As mentionedabove, durin
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1910, booksubjectanatomy
