ELECTRICAL STUDIES OF OVULATION IN THE RABBIT

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Abstract
Ovulation in the rabbit was associated with an abrupt change of electric potential between the vagina and the abdominal wall. The vagina became more positive by 5 to 12 millivolts and then slowly returned to its original potential in from 5 to 25 mins. The initial deflection was simultaneous with or a few secs. after rupture of the follicle. Ovulation in an externalized ovary, electrically insulated except for its blood-supply, gave no ovulation potential. Mechanically induced rupture gave one, provided the ovaries remained in situ. A similar electrical change was recorded from a micro-pipette electrode when it was inserted into the substance of the ovary during the intervals between fol-licular ruptures. This potential depended upon an active blood-supply and was not found in kidney, abdominal muscles, intestine, or a non-stimulated ovary.

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