. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. A B Fig. 20— Surface view of the first stages of cleavage in the hen's egg (after Coste): a, border of the germ-disk; 6, vertical furrow ; c, small central segment; d, large peripheral segment. upper to the lower surface of the germ-disk, dividing it into two equal parts. Another groove, crossing the first at a right angle, bisects each of the two segments, and each of these is in turn bisected by a radial furrow, so that the germ-disk now consists of eight sector-shaped cells. Cross furrows, ap
. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. A B Fig. 20— Surface view of the first stages of cleavage in the hen's egg (after Coste): a, border of the germ-disk; 6, vertical furrow ; c, small central segment; d, large peripheral segment. upper to the lower surface of the germ-disk, dividing it into two equal parts. Another groove, crossing the first at a right angle, bisects each of the two segments, and each of these is in turn bisected by a radial furrow, so that the germ-disk now consists of eight sector-shaped cells. Cross furrows, appearing near the center of the disk, cut off the apices of the sectors, adding small central segments. Cell- division continues until the germ-disk consists of a flattened mass of cells, several strata thick, lying on the surface of the yolk. The second method of meroblastic segmentation is (b) Peripheral cleavage, which occurs in the centrolecithal ova of arthropods (Fig. 7). In these eggs, it will be remem-. 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 Heisler, John Clement; Waterstone, David, former owner; Duke-Elder, Stewart, 1898-1978, former owner; University College, London. Library Services. Philadelphia : W. B. Saunders Company
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