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Temperature Changes in the Different Parts of the Rabbit's Oviduct

THE BIOPROCESSES that bring about passage of a fertilized and dividing egg to its normal locus of implantation terminating in a normal intrauterine pregnancy take place in various anatomic portions of the oviduct. Lately researchers have concentrated on the various areas of the oviduct as having, at least hypothetically, different functions in the fertilization process, e.g. the fimbrial apparatus, which captâtes the egg, the ampulloisthmic area, which may be considered as the site of fertilization in the rabbit, and the uterotubal junction, which regulates the mechanism of transport of the egg through the oviduct. The oviduct is the site of intense metabolic activity, which may be related to the fluctuations of its vascularity. It is thus possible that an investigation of this vascularity will explain the differences in the volume of collected fluid in various parts of the oviduct, and even the difference in the chemical composition of this fluid. Markee, in 1932, first described changes in the vascularization of the uterus as being a function of the normal ovarian hormonal cycle. His findings were based upon direct observations of the blood vessels at various cycle times in rabbits, guinea pigs, and monkeys. Reynolds showed that one can