. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. THE CORPUS LUTEUM 361 of 8-28 ±0-82 cm. might be expected to include a slightly lower proportion with cavities than pregnancy- corpora. Of fifteen corpora lutea of ovulation examined in 1953/54 and 1955/56, only one (67%) possessed a central cavity, but this is too small a sample to give a significant result. Accessory corpora lutea Of 760 corpora lutea examined, 28 or 37% were accessory corpora ranging from 0-4 to 8-5 cm. in diameter, the mean diameter being 3-88±o-8 cm. and the weight about 45
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. THE CORPUS LUTEUM 361 of 8-28 ±0-82 cm. might be expected to include a slightly lower proportion with cavities than pregnancy- corpora. Of fifteen corpora lutea of ovulation examined in 1953/54 and 1955/56, only one (67%) possessed a central cavity, but this is too small a sample to give a significant result. Accessory corpora lutea Of 760 corpora lutea examined, 28 or 37% were accessory corpora ranging from 0-4 to 8-5 cm. in diameter, the mean diameter being 3-88±o-8 cm. and the weight about 45 g. It is likely that many more small accessory corpora lutea form, but corpora less than 7 mm. in diameter are usually missed in the routine examinations; one accessory corpus 1 mm. in diameter has, however, been seen in histological preparations. The material is rather too sparse to allow firm conclusions to be drawn, but accessory corpora lutea of ovulation appear to occur as frequently as accessory corpora lutea of Text-fig. 10. Morphological variation in accessory corpora lutea. See text. They fall into two main groups; the larger, having developed from ruptured follicles, show a stigma and small corona, but the smaller are formed from unruptured follicles. A female fin whale 73 ft. in length taken on 8 February 1954 had recently ovulated, but no products of conception were seen in the uterus. There were three small corpora lutea in one ovary, one of which, 23-5 mm. in diameter, had ovulated, and two measuring 13 and 15 mm. (Text-fig. log, h) had developed from unruptured follicles. The appearance of the luteal cells is similar in all three. They are derived from the membrana granulosa because theca interna cells can be seen at the periphery of the gland 5-2. 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 th
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