. The development of the chick; an introduction to embryology. Birds -- Embryology. ALLMEXTARY TRACT AND ITS APPEXDAGES 329 to imagine the manner in which they must form, from the anatomy of the aduh lung; small branches must arise radially around the central parabronchi and penetrate to the margins of each hexagonal area, branching on the way and terminating in the final alveoli. /f-f. Fig. 190. — Transverse section through the lungs of a chick embryo of 11 days, a. th. A. S., Anterior thoracic air-sac. Ao., Aorta. Aur. d., s., Right and left auricles. B. d., s., Right and left ducts of Botal
. The development of the chick; an introduction to embryology. Birds -- Embryology. ALLMEXTARY TRACT AND ITS APPEXDAGES 329 to imagine the manner in which they must form, from the anatomy of the aduh lung; small branches must arise radially around the central parabronchi and penetrate to the margins of each hexagonal area, branching on the way and terminating in the final alveoli. /f-f. Fig. 190. — Transverse section through the lungs of a chick embryo of 11 days, a. th. A. S., Anterior thoracic air-sac. Ao., Aorta. Aur. d., s., Right and left auricles. B. d., s., Right and left ducts of Botallus. F., Feather germs. Li., Liver. P. C, Pericardial cavity, p. p. M., Pleuroperitoneal membrane. P. v., Pulmonary vein. Par'b., Parabronchi. PI. C, Pleural cavity. Pt. C, Peritoneal cavity. R., Rib. Sc, Scapula. V. d., s., Right and left ventri- cles. The expanding lungs nearly fill the pleural cavities on the eleventh day. Subsequently, the pleural cavity is obliterated by fusion of the free surfaces of the lungs with the wall of the pleural cavities. Thus it happens that the dorsal surfaces of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lillie, Frank Rattray, 1870-1947. New York, Holt
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