. The elements of Embryology. Embryology. 184 THE THIRD DAY. Fig. 63. [chap. S0~'i. ' Two Longitudinal Sections of the Tail-end of an Em- bryo Chick to shew the Origin op the Allantois. A at the beginning of the Third Day ; B at the MIDDLE OP the Third Day. (After Dobrynin.) t. the tail; m. the mesoblast; ocf. the epiblast; .r". the neural canal; Dd. the dorsal wall of the hindgut; SO. somato- pleure; *S^^. splanchnopleure; u. the mesoblast of the splanchnopleure carrying the vessels of the yolk-sac ; pp. pleuroperitoneal cavity; Df. the epithelium lining the pleuroperitoneal cavity;
. The elements of Embryology. Embryology. 184 THE THIRD DAY. Fig. 63. [chap. S0~'i. ' Two Longitudinal Sections of the Tail-end of an Em- bryo Chick to shew the Origin op the Allantois. A at the beginning of the Third Day ; B at the MIDDLE OP the Third Day. (After Dobrynin.) t. the tail; m. the mesoblast; ocf. the epiblast; .r". the neural canal; Dd. the dorsal wall of the hindgut; SO. somato- pleure; *S^^. splanchnopleure; u. the mesoblast of the splanchnopleure carrying the vessels of the yolk-sac ; pp. pleuroperitoneal cavity; Df. the epithelium lining the pleuroperitoneal cavity; All. the commencing allantois; w. projection formed by anterior and posterior divisions of the primitive streak; y. hypoblast which will form the ventral wall of the hindgut; v. anal invagination (procto- dceum); O. cloaca. day project beyond this point; but on the fourth day begins to pass out beyond the body of the chick, along the as yet wide space between the splanchnic and soma- tic stalks of the embryo, on its way to the space between the external and internal folds of the amnion, which it will be remembered, is directly continuous with the pleuroperitoneal cavity (Fig. 9 K). In this space it. 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 Foster, M. (Michael), Sir, 1836-1907. London, MacMillan
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Keywords: ., bookautho, bookcentury1800, bookdecade1880, booksubjectembryology
