. The anatomical record. Anatomy; Anatomy. CHANGES IN REPRODUCTIVE ORGANS—ALBINO RATS 221 The cytoplasm of the lutein cells is more eosinophilic. In cases where the central cavity is obliterated, a corpus atreticum com- posed of modified theca interna cells is formed. Side by side with the above-described atretic follicles are found those with the theca cells modified into the lutein cells. Such follicles have often a large central cavity. Matsuyama thinks that this tyi^e is peculiar to the ovaries of parabioses, but in my sections of the ovaries of old females this kind of fol- licle is not u
. The anatomical record. Anatomy; Anatomy. CHANGES IN REPRODUCTIVE ORGANS—ALBINO RATS 221 The cytoplasm of the lutein cells is more eosinophilic. In cases where the central cavity is obliterated, a corpus atreticum com- posed of modified theca interna cells is formed. Side by side with the above-described atretic follicles are found those with the theca cells modified into the lutein cells. Such follicles have often a large central cavity. Matsuyama thinks that this tyi^e is peculiar to the ovaries of parabioses, but in my sections of the ovaries of old females this kind of fol- licle is not uncommon. A feature that may rightly be called characteristic of the ovaries of parabiosis is the enormous growth of the interstitial Fig. 2 Portion of ovary showing six groups of interstitial cells (forty-seven days of parabiotic union). X 86. Matsuyama has noticed this peculiar change also. This is met with especially in the female, which is operated upon when young; that is, at a stage in which the folHcles have not yet attained their full size. It cannot be doubted that the interstitial cells are modified theca cells. Consequently, the folhcular cavity is found, in most cases, inside the mass of these cells and in some cases degener- ating ova and debris of the granulosum layer, as is shown in figure 2. The lutein cells are sometimes found among the interstitial cells. They can readily be distinguished, since the former have large nuclei and a single nucleolus in each, while the latter. 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 Bardeen, Charles Russell, 1871-1935, ed; Boyden, Edward A. (Edward Allen), 1886-1976; Bremer, John Lewis, 1874- ed; Hardesty, Irving, b. 1866, ed; American Association of Anatomists; American Society of Zoologists; Wistar Institute of Anatomy and Biology. [New York,
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