[Role of noradrenaline-sensitive neurons of the preoptic area in regulating luteinizing hormone release].

The effect of the microiontophoretic application of noradrenaline to the preoptic area of the hypothalamus on the unit activity and on the plasma and hypophysis LH levels was studied at various stages of estrous cycle. The activatory reaction of the preoptic neurons seems to increase the LH level in the blood. No direct correlation existed between the mode of the unit response to noradrenaline and the LH level changes in hypophysis.