. The development of the albino rat, Mus norvegicus albinus. Embryology -- Mammals; Rats. DEVELOPMENT OF THE ALHIXO KAT 51 shown in all 'An nuclei, two of which arc in a laic diasler phase. By excluding"; the nuclei that appear to he cut in two, appearing thus in two successive sections, T estimate that the hlastodennic vesicle is made up of only about ;^0 to 32 cells. In figure 22, there are reproduced typical sections of four blastodermic vesicles taken from the uterus of rat No. 5:^, killed five days after the beginning of insemination. This uterus con- tained in all, eight vesicles, o
. The development of the albino rat, Mus norvegicus albinus. Embryology -- Mammals; Rats. DEVELOPMENT OF THE ALHIXO KAT 51 shown in all 'An nuclei, two of which arc in a laic diasler phase. By excluding"; the nuclei that appear to he cut in two, appearing thus in two successive sections, T estimate that the hlastodennic vesicle is made up of only about ;^0 to 32 cells. In figure 22, there are reproduced typical sections of four blastodermic vesicles taken from the uterus of rat No. 5:^, killed five days after the beginning of insemination. This uterus con- tained in all, eight vesicles, one of which was distinctly pathologic. The four vesicles selected for reproduction and discussion pre- sent each certain characteristics worthy of consideration. â Vesi- cle A, which presents an early stage of segmentation cavity forma-. Vlg. 22 Sections of oarly stages of blastodermic vesicle of tlie albino rat, X 2G0. Rat Xo. 53, 5 days. tion is of interest owing to the number of mitotic divisions it contains. As a rule, I have noticed only a few mitoses at this stage. In this vesicle, which measures 90 n by 55 m by approxi- mately 40 ju, there are no less than five mitoses to be noted, three of which are in cells forming the roof of the small segmentation cavity, and are included in the section figured. This is the only vesicle in my possession in which an increase in the size of the segmentation cavity is accompanied b}" active mitoses in the cells bounding it. The vesicle lies free in the uterine lumen, one wall of which is only slightly pitted. In B of figure 22 is reproduced a section of a blastodermic vesicle, measuring 90 m by 55 /x by approximately 45 fx. It is evident that this vesicle. 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, bookleafnumber57, bookpublisherphiladelphiapa, bookyear1915
