. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. 58 TEXT-BOOK OF EMBRYOLOGY. narrow fissure, and its blastopore, situated at the posterior margin of the germ-disk, is exceedingly small. The Embryonal Area.—Upon the surface of the germ at the beginning of gastrulation—that is, at about the fifth day of development in the case of the rabbit's germ—there is. Fig. 32.—Longitudinal section through the germ-disk of a fertilized unincubated egg of the nightingale (after Duval): ak, outer, ik, inner germ-layer; ud, ccelen- teron; vl, anterior, hi, pos
. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. 58 TEXT-BOOK OF EMBRYOLOGY. narrow fissure, and its blastopore, situated at the posterior margin of the germ-disk, is exceedingly small. The Embryonal Area.—Upon the surface of the germ at the beginning of gastrulation—that is, at about the fifth day of development in the case of the rabbit's germ—there is. Fig. 32.—Longitudinal section through the germ-disk of a fertilized unincubated egg of the nightingale (after Duval): ak, outer, ik, inner germ-layer; ud, ccelen- teron; vl, anterior, hi, posterior lip of the blastopore (crescentic groove). a round whitish spot, the embryonal area. Its position corre- sponds to that formerly held by the inner cell-mass of the blastodermic vesicle, as shown in Plate I., Fig. 2. It is only in this region that the wall of the vesicle is, at this particular stage, composed of more than a single layer of cells, the ecto- derm and the entoderm not extending much, if at all, beyond its periphery. The embryonal area, soon becoming oval (Fig. 33) and, later, pear-shaped, exhibits, at its posterior margin, a trans- og ^_ ag. 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
Size: 3785px × 660px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpubli, booksubjectembryology
