. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 350 THE DEVELOPMENT OF THE CHICK sively ventral and posterior. The definitive ventral surface of the heart is a cranial rather than a ventral surface during the critical period of development described below, up to eight days (cf. Figs. 148 and 150). In other words, the apex of the heart is directed ventrally rather than posteriorly, though it has a posterior inclination. For simplicity of de- scription, however, it seems better to use the definitive orientation in the following account; that is, t
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 350 THE DEVELOPMENT OF THE CHICK sively ventral and posterior. The definitive ventral surface of the heart is a cranial rather than a ventral surface during the critical period of development described below, up to eight days (cf. Figs. 148 and 150). In other words, the apex of the heart is directed ventrally rather than posteriorly, though it has a posterior inclination. For simplicity of de- scription, however, it seems better to use the definitive orientation in the following account; that is, to regard the apex of the heart as posterior instead of ventral, and the bulbus face of the heart as ventral instead of cranial, in Fig. 200. — Ventral view of the heart of a chick embryo of mm. head-length. (After Masius.) Atr. d., s., Right and left auricles. B. Co., Bulbus cordis. V., Ventricle. Division of the Cavities of the Heart. The embryonic heart is primarily a single continuous tube; during development a complex series of changes brings about its complete division into right and left sides, corresponding to the pulmonary and systemic circulations. Partitions or septa arise independently in each primary division of the cardiac tube, excepting the sinus venosus, and subsequently these unite in such a way as to make two independent circulatory systems. During this time 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 : Henry Holt
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Keywords: ., bookauthorlilliefrankrat, bookcentury1900, booksubjectembryology
