The book The Elements of Embryology volume 1 was written by author M Michael Foster Here you can read free online of The Elements of Embryology volume 1 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Elements of Embryology volume 1 a good or bad book?
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Though the whole organ still exhibits a marked curvature to the right, the ventricular portion becomes directed more distinctly ventralwards, forming a blunted cone whose apex will eventually become the apex of the adult heart. The concave (or dorsal) walls of the ventricles be- come much thicker, as did the convex or ventral walls on the third day. Well-marked constrictions now separate the ven- tricles from the bulbus arteriosus on the one hand, and from the auricles on the other. The latter ...constriction is very distinct, and receives the name of canalis auri- cularis (Fig. 75, C. A. ) ; the former, sometimes called the /return Halleri, is far less conspicuous. FIG. 75. C. A HEART OF A CHICK ON THE FOURTH DAY OF INCUBATION VIEWED FROM THE VENTRAL SURFACE. La. Left auricular appendage. C. A. Canalis auricularis. V. Ven- tricle. 6. Bulbus arteriosus. 230 THE FOURTH DAY. [CHAP. The most important event is perhaps the formation of the ventricular septum. This, which commenced on the third day as a crescentric ridge or fold springing from the convex or ventral side of the rounded ven- tricular portion of the heart, now grows rapidly across the ventricular cavity towards the concave or dorsal side.
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