. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 209 Fig. 120). A more complete description of the cavities is given in Chapter XI. The median wall of the pleural grooves forms much during the formation of the lung diverticula, and thus initiates the formation of lobes enclosing the lungs (Figs. 118 and 119). These lobes descend ventrally and unite with the septum trans- versum (see below), thus producing blind bays of the coelome nX,-. ^<5Y. /?ec/'. jris-tdor^- stom. '/v'a' / Fig. 119. —Transverse secti
. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 209 Fig. 120). A more complete description of the cavities is given in Chapter XI. The median wall of the pleural grooves forms much during the formation of the lung diverticula, and thus initiates the formation of lobes enclosing the lungs (Figs. 118 and 119). These lobes descend ventrally and unite with the septum trans- versum (see below), thus producing blind bays of the coelome nX,-. ^<5Y. /?ec/'. jris-tdor^- stom. '/v'a' / Fig. 119. —Transverse section of the same embryo through the lateral mesocardia. Liv., Liver, m's'c. lat., Lateral mesocardiiim. m's't. access., Accessory mesentery, m's't. ven., Ventral mesentery. Other abbreviations as before. at the sides of the oesophagus, known as the superior recesses of the peritoneal cavity or pulmo-enteric recesses. The ventral mesentery extends from the anterior end of the sinus venosus to the hind end of tlie fore-gut, where it unites with the ventral body-wall. It includes the sinus venosus and the ductus venosus, together with the hepatic diverticula. The median and lateral mesocardia, together with the ventral mesen- tery of the fore-gut, form a mass known as the septum 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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