. The development of the albino rat, Mus norvegicus albinus. Embryology -- Mammals; Rats. ,' Fig. 28 A series of cross sections at different levels of an egg-cylinder of the albino rat after the anlage of the antimesometrial portion of the proamniotic cavity. X 200. Kat No. 27, 7 days, 17 hours, after insemination. The sec- tions selected for the several levels drawn, A to D, are as follows: A, middle of ectoplacental cone; B and C, through extraembryonic ectodermal portion of egg-cylinder, just below junction with ectoplacental cone (B), and just above ectodermal vesicle (C); D, thr
. The development of the albino rat, Mus norvegicus albinus. Embryology -- Mammals; Rats. ,' Fig. 28 A series of cross sections at different levels of an egg-cylinder of the albino rat after the anlage of the antimesometrial portion of the proamniotic cavity. X 200. Kat No. 27, 7 days, 17 hours, after insemination. The sec- tions selected for the several levels drawn, A to D, are as follows: A, middle of ectoplacental cone; B and C, through extraembryonic ectodermal portion of egg-cylinder, just below junction with ectoplacental cone (B), and just above ectodermal vesicle (C); D, through middle of ectodermal vesicle. Compare with B, figure 26, a longitudinal section of an egg-cylinder of the same stage of development; , parietal or transitory ectoderm; , extraembryonic ectoderm; , primary embryonic ectoderm of the ectodermal vesicle; , visceral entoderm; , primary embryonic entoderm; , antimesometrial portion of jiroamniotic cavitj'. portion of the proamniotic cavit^^ p]mphasis is given to the fact that in the antimesometrial portion of the egg-cylinder, there may be recognized the primary embrj'onic ectoderm. His own words with reference to this point read as follows: Der Schnitt zeigt nun sehr deutlich, dass sich die Zellen, die die antimesometrale Hohle so bcgrenzen, dass die alte Kugel-oder Eiform dieses Teiles noch zii erkennen ist—das primare eni])ryonale Ectoderm —intensiver fiirben wie die Zcllen des mesornctralcn Abschnittcs oder die des Ectoplacentarconus—das extraembryonale p]ctoderm. Die Kerne zeigen kemerlei Unterschied in der Far])ung, wohl aljer das Plasma, dass im antimesometralen Tcile von dichtcrer Structiu' zu sein schcint. This description corresponds ver}- closely to that given b\^ me for a similar stage. The differentiation of these two kinds of ectoderm was also recognized hf Robinson, who states:. Please note that these images are extracted from scanned page images that may ha
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