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At least 271 records · Page 15Linked to original sources
PubMed1989

Changes in estrogen receptors in the mediobasal hypothalamus mediate the facilitory effects exerted by the male's olfactory cues and progesterone on feminine behavior in the male rat.

The purpose of this study was to determine whether facilitory effects exerted by olfactory cues on lordosis behavior in the male rat involved changes in estradiol receptors at the hypothalamic level. Male rats were orchidectomized as adults. They were given either 25 micrograms estradiol benzoate (EB) alone or 25 micrograms EB and 100 micrograms progesterone (P) sequentially and exposed or not to the odor of male urine. Some of them were tested for lordosis behavior at 8 h after P. The other ones were killed 4 h after P and used for estradiol (E2) and P receptor assay in mediobasal hypothalamus (MBH). Olfactory cues were shown to increase the number of E2 receptors in both the animals given EB or EB + P. Progesterone as such appeared to be capable of increasing the number and the rate of occupancy of E2 receptors. A population of constitutive and estrogen-inducible P receptors was detected in the MBH. Since only the animals given EB + P were shown to be sensible to the facilitory effects of male urine on lordosis behavior, it may be assumed that E2 and P on one hand and olfactory cues on the other exert cumulative effects at the level of the MBH and that both a high level and a high rate of occupancy of E2 receptors are necessary for the olfactory cues to facilitate the display of lordosis behavior in the male rat.

Animals↗
PubMed1985

Evidence for peripeduncular neurons having a role in the control of feminine sexual behavior in the rat.

In order to test the hypothesis that peripeduncular nucleus (PPN) cells are essential for normal sexual behavior, synaptic blockade in the chronically implanted awake animal was attempted by means of the local injection of pentobarbital (PB) at a concentration which may interfere with synaptic transmission without affecting conduction in fibers. Ovariectomized, female rats were chronically implanted with cannulae directed to the PPN or the dorsal midbrain. After adequate estrogen priming, rats were injected with 22 mM pentobarbital (PB) or artificial cerebrospinal fluid (ACSF). Seven min after PB injection in PPN lordosis quotient was significantly lowered, whereas PB in dorsal midbrain or ACSF in PPN had no effect. It is concluded that PPN neurons themselves may have a functional role in the control of lordosis and that loss of PPN neurons may account for impairment of reproductive behavior observed after lesions in the ventrolateral midbrain.

Animals↗
PubMed1984

Pathways conducting amygdaloid influence on feminine sexual behavior in the rat.

In ovariectomized female rats primed with estradiol benzoate and progesterone, electrochemical stimulation of medial amygdaloid nucleus, anterior part ( AMEa ), increased lordotic frequency, but this effect was not found in rats with transection of the stria terminalis (ST) or the ventral amygdalofugal pathways ( VAF ). On the other hand, the decrease in lordotic frequency observed after stimulation of the posterior part of the lateral amygdaloid nucleus (ALp), persisted in animals with transection of the VAF , but was eliminated in animals with section of the ST. The effect of transecting these pathways on the multiunit and field responses evoked in the hypothalamic ventromedial nucleus (VMN) by stimulation of both amygdaloid nuclei was also studied. Responses evoked by AMEa stimulation were smaller or disappeared after lesion of either the ST or the VAF , but responses evoked by ALp stimulation were affected by lesion of the ST only. Findings are interpreted as suggesting that the ST conducts activity originating in AMEa and ALp which affects sexual receptivity in a complementary fashion, whereas VAF contains AMEa originated fibers whose activation increase receptivity. These behavioral effects may be the consequence of modulatory action on VMN neuronal activity.

Amygdala↗
PubMed1995

The menstrual cycle, science and femininity: assumptions underlying menstrual cycle research.

This paper examines the relationship between popular knowledge of menstruation and scientific research. It suggests that despite evidence to indicate that pre-menstrual cognitive, behavioural and emotional 'impairment' is relatively rare, the population notion that PMS routinely affects many women adversely is difficult to displace. It concludes that mainstream menstrual cycle research is subject to the influence of misogynist mythology upheld as staunchly by women influenced by patriarchy as by men. Reasons are suggested which lie in the differential power of claims to knowledge.

Adult↗