. The development of the albino rat, Mus norvegicus albinus. Embryology -- Mammals; Rats. DEVELOPMENT OF THE I{A'l' 35 This series, it seems to me, corroborates the stidcmeut previously made, that the detail of form of the Hving segmenting ova of certain mammals, while in transit through the oviduct, is in a great measure dependent on the configuration pi-escMited by the lumen of the oviduct in the particular i-egion in which the}' are found. r3-cell to 16-cell stages. Rat No. 51, killed 4 days after the beginning of insemination, presents the end of the segmentation stages in the ovidu
. The development of the albino rat, Mus norvegicus albinus. Embryology -- Mammals; Rats. DEVELOPMENT OF THE I{A'l' 35 This series, it seems to me, corroborates the stidcmeut previously made, that the detail of form of the Hving segmenting ova of certain mammals, while in transit through the oviduct, is in a great measure dependent on the configuration pi-escMited by the lumen of the oviduct in the particular i-egion in which the}' are found. r3-cell to 16-cell stages. Rat No. 51, killed 4 days after the beginning of insemination, presents the end of the segmentation stages in the oviduct. In the genital tract of this animal there were found eight morula masses, five on the left side and three on. Fig. 19 Sections of morula stages of the albino rat. X 2UU. A, 8-cell stage, rat No. 57, 3 days, 17 hours; six of the eight cells, each cut in the plane of its nucleus, are included in the section figured. B, C, and D, 12-cell to 16-cell stages, from right oviduct, rat No. 51, 4 days. the right side. It is somewhat difficult to determine definitely the number of cells constituting each of the morula. The number appears to vary between 12 and 18, though nearly all of the moru- la masses show certain nuclei in mitosis. The left oviduct with a short adjoining segment of the uterine horn was reconstructed. Slight tension was applied to the tissue prior to fixation, which accounts for the elongation of the proximal loop of the oviduct. The model is reproduced in figure 18. As is evident on study of this figure, three of the morula masses are situated in a por- tion of the oviduct just prior to its insertion in the uterine tube. These are closely grouped between folds of the mucosa. A fourth morula is found in the uppermost part of the uterine. 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, Got
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