. The development of the albino rat, Mus norvegicus albinus. Embryology -- Mammals; Rats. DEVELOPMENT OF TH K ALBIXO HAT 65 vesicles arc cut in an ohliciuc plane, wiiich may deviate (jnly a little from tlie longitudinal or may approach a cross axis, while only a relatively smaU number of vesicles were cut favor- ably in the lonj^itudiiial plane, and the majority of these are in series cut parallel to the plane of the mesometrium. The vesi- cles on which the special consideration of this stage is ])ased are reproduced as seen in sections, in fif!;ure 24. Vesicle A, of figure 24 (rat No. 4(i, ()
. The development of the albino rat, Mus norvegicus albinus. Embryology -- Mammals; Rats. DEVELOPMENT OF TH K ALBIXO HAT 65 vesicles arc cut in an ohliciuc plane, wiiich may deviate (jnly a little from tlie longitudinal or may approach a cross axis, while only a relatively smaU number of vesicles were cut favor- ably in the lonj^itudiiial plane, and the majority of these are in series cut parallel to the plane of the mesometrium. The vesi- cles on which the special consideration of this stage is ])ased are reproduced as seen in sections, in fif!;ure 24. Vesicle A, of figure 24 (rat No. 4(i, () days, 14 hoursj, is drawn from two successive sections. The upper portion of the figure. Fig. 24 Sections of blastodermic vesicles or blastocA-sts of the albino rat showing the earl}' stages; of entypj- of the germ disc. X 200. A and B, rat No. 46, 6 days, 14 hours; C, rat Xo. 54, 6 daj's, 16 hours; , ectoplacental cone or TrJiger; , ectodermal node; , parietal or transitory ectoderm; v. ent., visceral layer of entoderm; , parietal entoderm. was drawn under camera lucida from one section, then by super- imposing certain of the cells so as to give proper orientation, the lower half of the figure was added from the succeeding section. The slightly oblique plane in which this vesicle was cut made this procedure desirable. This relatively small vesicle seems in excellent state of fixation, as is evident from the symmetrical outline shown by the successive sections of the series. When compared with vesicle E of figure 23, though the two are sepa- rated in time of development b}" only a few hours, it is evident. 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 Huber, Gotthelf Carl, 1865-. Philadelphia, Pa
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Keywords: ., book, bookleafnumber71, bookpublisherphiladelphiapa, bookyear1915
