. The elements of embryology. Chickens -- Embryos. 192 THE FIFTH DAY. [CHAP. The external constriction actually dividing the bulbus into two vessels, does not begin to appear till the septum has extended some way back towards the heart. The semilunar valves become pocketed at a period con- siderably later than their first formation (from the 147th to the 165th hour) in the order of their appearance. 8. Towards the end of the fifth and in the course of the sixth day further important changes take place in the heart. The venous end with its two very conspicuous auricular appendages, comes to be
. The elements of embryology. Chickens -- Embryos. 192 THE FIFTH DAY. [CHAP. The external constriction actually dividing the bulbus into two vessels, does not begin to appear till the septum has extended some way back towards the heart. The semilunar valves become pocketed at a period con- siderably later than their first formation (from the 147th to the 165th hour) in the order of their appearance. 8. Towards the end of the fifth and in the course of the sixth day further important changes take place in the heart. The venous end with its two very conspicuous auricular appendages, comes to be situated more above (dorsal to) the arterial end, though it still turns rather towards the left. The venous portion of the heart undergoes on the sixth day or even near to the end of the fifth, such a development of the muscular fibres of its walls, that the canalis auricularis becomes almost entirely concealed. The point of the heart is now ri> Fig. 6o. A. 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; Balfour, Francis M. (Francis Maitland), 1851-1882. London, Macmillan and co.
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1874
