. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. 48 TEXT-BOOK OF EMBRYOLOGY. neath. The inequality of the resulting segments, as well as the direction of the cleavage planes, may be appreciated by reference to Fig. 1 9, which represents a frog's ovum. 2. Meroblastic ova are those in which the segmentation is partial, division being limited to the formative yolk, or protoplasm. (a) Partial discoidal cleavage is the variety of meroblastic cleavage that occurs in those telolecithal ova having a germ- disk (Fig. 8), to which latter the segmentatio
. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. 48 TEXT-BOOK OF EMBRYOLOGY. neath. The inequality of the resulting segments, as well as the direction of the cleavage planes, may be appreciated by reference to Fig. 1 9, which represents a frog's ovum. 2. Meroblastic ova are those in which the segmentation is partial, division being limited to the formative yolk, or protoplasm. (a) Partial discoidal cleavage is the variety of meroblastic cleavage that occurs in those telolecithal ova having a germ- disk (Fig. 8), to which latter the segmentation is limited. This method of segmentation is seen in the eggs of birds, reptiles, and fishes. In the egg of the bird, which may be taken as a typical example, the germ-disk, in whatever posi- tion the egg may be placed, floats on the top of the yolk. The beginning of the first segmentation is indicated by a furrow in the center of the surface of the germ-disk (Fig. 20). This furrow deepens, cutting vertically from 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 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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