The temeprature gradient in males is based on two simultaneous principles: cooling of the testis through the scrotal wall and transfer of heat between the testicular blood vessels.
The ovary is positioned in the abdomen; a temperature difference parallel to the male system therefore seems less likely.
However, the temperature of large follicles has been found to be 0.5 to 1.5 °C cooler than the ovarian stroma in rabbits, pigs and, probably, women.
The temperature difference seems to be based on a heat-consuming process in the expanding follicullar fluid, and a local transfer of heat between intra-ovarian blood vessels.
The reason for the temperature gradient is not yet known; one may speculate of a common reason for the cooling of the gamete in male and female.
Source: Hunter, R. H. F. & Einer-Jensen, N. (2005): Pre-ovulatory temperature gradients within mammalian ovaries: a review. In: Journal of Animal Physiology and Animal Nutrition 89 (7-8), 240-243.
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