. Elements of histology. Histology. Heart and Blood-vessels. 11^ ail isolated cell, its protoplasmic processes grow l)y degrees to th(! nearest capillary, to the wall of which they become fixed, and the cavity of the cell finally opens through such processes into that of the capillary vessel. The islets or cysts of blood that appear early in the area vasculosa of the embryo are due to vacuolation of. Fig. SI.—Cells from inesoblast of chick's blastoderm undergoing develop- ment into blood-vessels in the area vasculosa. (Handbook.) ", Cavitj- of cell; b, cell wall; /, cells not yet hollowed
. Elements of histology. Histology. Heart and Blood-vessels. 11^ ail isolated cell, its protoplasmic processes grow l)y degrees to th(! nearest capillary, to the wall of which they become fixed, and the cavity of the cell finally opens through such processes into that of the capillary vessel. The islets or cysts of blood that appear early in the area vasculosa of the embryo are due to vacuolation of. Fig. SI.—Cells from inesoblast of chick's blastoderm undergoing develop- ment into blood-vessels in the area vasculosa. (Handbook.) ", Cavitj- of cell; b, cell wall; /, cells not yet hollowed out; d, hlood corpuscles. spherical or elongated vasoformative cells of the meso- blast, the islets or cysts being composed of a central portion which are blood corpuscles, at first white, then red, and a joeripheral protoplasmic nucleated envelope, the future vascular wall. The central nucleated blood cells develop by a process of endogenous division from the original cell protoplasm. The blood cysts, at first isolated, afterwards become connected by protoplasmic processes with other cysts or other vasoformative cells, ultimately forming a network of vessels (Fig. 81). The. wall of young capillaries is granular-looking })rotoplasm (the original cell substance), and in it. 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 Klein, E. (Edward), 1844-1925; Edkins, John Sydney, b. 1865. Philadelphia : Lea Brothers
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