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Abstract
Cholinergic antagonists were bilaterally infused into forebrain areas of ovariectomized female rats brought into sexual receptivity by administration of estrogen and progesterone. Infusion of hemicholinium-3 (HC-3, 5 or 7.5 μg/cannula), an acetylcholine synthesis inhibitor believed to interfere with choline uptake, decreased the incidence of lordotic behavior displayed by females. This inhibition was prevented by infusion of choline chloride (120 μg/cannula) along with HC-3. Atropine sulfate, an acetylcholine receptor blocker, also reduced lordotic behavior in females following intracerebral infusion (20 μg/cannula). These results lend support to the suggestion that lordotic behavior is facilitated by central cholinergic activity.
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