. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. DEVELOPMENT. 201 The blood-vessels ramify in all directions through the yolk, making it a spongy mass, and all perform the same office; it is not till the fourth or fifth day that arteries can be distinguished from veins, by being thicker, and by carrying blood only from the Fig. 169.—Embryo in a Hen's Egg during the first five days: A, hypoblast; B, lower layer of mesoblast; C, upper layer of mesoblast and epiblast united, in the last figures f
. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. DEVELOPMENT. 201 The blood-vessels ramify in all directions through the yolk, making it a spongy mass, and all perform the same office; it is not till the fourth or fifth day that arteries can be distinguished from veins, by being thicker, and by carrying blood only from the Fig. 169.—Embryo in a Hen's Egg during the first five days: A, hypoblast; B, lower layer of mesoblast; C, upper layer of mesoblast and epiblast united, in the last figures forming the amniotic sac; D, vitelline membrane; e, thickened blasto- derm, the first rudiment of the dorsal part (in the last figure it marks the place of the lungs); h, heart; a, b, its two chambers; c, aortic arches; m, aorta; i, liver; Pj 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 Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950. New York : Harper & Bros.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1883
