. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 226 THE DEVELOPMENT OF THE CHICK sides may be approximately in contact, and the cavity of the yolk-sac is thus broken up into numerous connecting compart- ments filled with yolk. The outer wall of the yolk-sac is smooth and not involved in the folds. The beginning of the folds of the yolk-sac may be found at the time of appearance of the vascular area of the blastoderm, and they develop 'pari passu, with the vessels of the yolk-sac (Fig. 131). Fig. 131 shows the appearance of the folds at the stage
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 226 THE DEVELOPMENT OF THE CHICK sides may be approximately in contact, and the cavity of the yolk-sac is thus broken up into numerous connecting compart- ments filled with yolk. The outer wall of the yolk-sac is smooth and not involved in the folds. The beginning of the folds of the yolk-sac may be found at the time of appearance of the vascular area of the blastoderm, and they develop 'pari passu, with the vessels of the yolk-sac (Fig. 131). Fig. 131 shows the appearance of the folds at the stage of twelve somites. It is a view of the blastoderm from below, 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 : Henry Holt
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Keywords: ., bookauthorlilliefrankrat, bookcentury1900, booksubjectembryology
