. Fig. 125. Young luteal tissue from ovary of Blue Fig. 126. Older luteal tissue from ovary whale with 30 mm. foetus, v., vacuolated cells. of Blue whale with 6-3 m. foetus. of this kind were those with which no foetus was found and which were therefore either corpora lutea of ovulation or corpora lutea of pregnancy which accompanied foetuses so minute that they were missed. It appears that the regression in size of the corpus luteum is accompanied by the disappearance of the vacuoles in the luteal cells. The luteal tissue now stains intensely with Nile Blue, indicating the presence of plenty
. Fig. 125. Young luteal tissue from ovary of Blue Fig. 126. Older luteal tissue from ovary whale with 30 mm. foetus, v., vacuolated cells. of Blue whale with 6-3 m. foetus. of this kind were those with which no foetus was found and which were therefore either corpora lutea of ovulation or corpora lutea of pregnancy which accompanied foetuses so minute that they were missed. It appears that the regression in size of the corpus luteum is accompanied by the disappearance of the vacuoles in the luteal cells. The luteal tissue now stains intensely with Nile Blue, indicating the presence of plenty of fat. It is difficult to say whether the size of the corpus luteum continues to decrease up to the end of gestation owing to the small number of large foetuses which have been recorded, but in Fin whales there seems to be a slight decrease. It may be mentioned here that there are invariably many enlarged follicles in the ovaries of pregnant whales, and these range in magnitude from 40 mm. to 50 mm. in diameter to 10 mm. and less. During lactation one or two large follicles are found but the smaller ones are no longer visible. It is known that a functional corpus luteum inhibits the growth of ova and the incidence of ovulation, so that the follicles seen
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificexpedition
