Abstract
Publisher Summary This chapter reviews the effect of pregnancy and sex hormones on the transmitter level in uterine short adrenergic neurons. The short adrenergic neurons exhibit pronounced changes in their transmitter content also during pregnancy and after administration of female sex hormones. Such changes do not take place in organs, such as heart and ovary, supplied with the classical type of long adrenergic neurons. Fluctuations in uterine NE were followed fluorometrically throughout pregnancy and during the postpartum period in guinea-pigs. Within the first 10 days, the NE content was almost doubled. From the 15th day onward, the amine level showed a continuous decrease until a near-zero content was reached just before parturition, which occurs at approximately 65 days post coitum. A similar NE increase was found in the uterine horn devoid of fetuses from animals with unilateral pregnancy. Results show that uterine short adrenergic neurons are under hormonal control, and they indicate that the ovary is involved in the control mechanism.
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