. The physiology of reproduction. Reproduction. 470 THE PHYSIOLOGY OF REPRODUCTION V. Heukelom described the cellular layer outside the syncytium as fcetal, and derived from Langhans' layer.^ Whatever their. » e *. "e * ©⢠-dec Fig. 123.âSection of a portion of the wall of the human blastocyst. (Bryce and Teacher.) cyt., cyto-trophoblast; dec, decidna ; end., endothelium of maternal capillary ; â pi., Plasmodium ; »«., necrotic zone of decidua. ' Much uncertainty still exists regarding the origin of these large cells in Man and other animals. In the mouse, Duval and Sobotta consider
. The physiology of reproduction. Reproduction. 470 THE PHYSIOLOGY OF REPRODUCTION V. Heukelom described the cellular layer outside the syncytium as fcetal, and derived from Langhans' layer.^ Whatever their. » e *. "e * ©⢠-dec Fig. 123.âSection of a portion of the wall of the human blastocyst. (Bryce and Teacher.) cyt., cyto-trophoblast; dec, decidna ; end., endothelium of maternal capillary ; â pi., Plasmodium ; »«., necrotic zone of decidua. ' Much uncertainty still exists regarding the origin of these large cells in Man and other animals. In the mouse, Duval and Sobotta consider them foetal, Kolster and Disse maternal, and Jenkinson both fcetal and maternal. In the guinea-pig, v. Spee states that they are fcetal. In the hedgehog they were first described by Hubrecht as maternal, and later as foetal. In Man, as stated above, the same doubt exists whether the trophoblast con- sists of two layers, oytoblast and plasmodiblast, or possesses a third layer composed of large cells, and forming the advance guard in attacking the uterine mucous membrane and enlarging 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 Marshall, F. H. A. (Francis Hugh Adam), 1878-1949; Cramer, William, 1878-1945; Lochhead, James. London, New York, Longmans, Green
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