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On the formation and regression of corpus luteum in the northern fur seal ovaries



On the formation and regression of corpus luteum in the northern fur seal ovaries



Scientific Reports of the Whales Research Institute Tokyo (29): 121-128



Corpus luteum and the process of its formation in the fur seal ovary, collected around the Robben Island [Japan] in the Okhotsk Sea, were studied. The regressive phases of follicle and corpus luteum were examined histologically. There are 2 kinds of corpus luteum; 1 is formed inside the vesicular follicle after ovulation, the other is formed outside the follicle without ovulation. The former is the true corpus luteum and the latter is the accessory corpus luteum or corpus atreticum. The function of corpus luteum graviditatis degenerates in the last stage of pregnancy. Corpus albicans originated from the true corpus luteum is distinguished from the corpus atreticum clearly. The former exists for about 2 yr in the ovary and then disappears, but the latter vanishes shortly.

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Accession: 006027282

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