. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. 1012 EMBRYOLOGY. The outline of the embryo distinctly appears as a very elongated ellipse. At itg inferior, extremity is seen (Fig. 549) a very slender crescent, the per- spective of which does not g've so good an idea of its disposition as longitudinal sections do. This appearance of the blastoderm seen on the surface, is due to the inflection of its margins downwards and inwards. The elliptical disc represented by the embryo, and which is lying flat on the yolk, gradually has its borders curved downwards, and
. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. 1012 EMBRYOLOGY. The outline of the embryo distinctly appears as a very elongated ellipse. At itg inferior, extremity is seen (Fig. 549) a very slender crescent, the per- spective of which does not g've so good an idea of its disposition as longitudinal sections do. This appearance of the blastoderm seen on the surface, is due to the inflection of its margins downwards and inwards. The elliptical disc represented by the embryo, and which is lying flat on the yolk, gradually has its borders curved downwards, and converging towards the middle on its ventral face. This inflection of the embryo brings about the formation of the walls of the body and its cavities. In their progressive incurvation, the borders circumscribe an aperture, which contracts and becomes the umbilicus. The inflection proceeds from before to behind, and is constituted by successive folds, which have been Fit;. 550. FiiT. AREA PELLUCIDA OF THE BLASTO- DERM OF A CHICK SOON AFTER THE FORMATION OF THE PRIMI- TIVE GROOVE. pr, Primitive trace with the primitive groove; af, amniotic fold. The shaded part around the primitive trace shows the extension of 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 Chauveau, A. (Auguste), 1827-1917; Arloing, S. (Saturnin), 1846-1911; Fleming, George, 1833-1901. New York : Appleton
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Keywords: ., bookauthorcha, bookcentury1900, bookdecade1900, booksubjecthorses
