Mounting and Lordosis Behavior in Androgen Primed Ovariectomized Rats : Effect of Dorsal Deafferentation of the Preoptic Area and Hypothalamus

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概要

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• Daily injections of 500μg testosterone propionate (TP) for 21days induced mounting behavior in all of 10 castrated male rats and the mean mount frequency (MF) for 30min was 32.4±6.6 (mean±S. E.). The same treatment with TP induced mounting behavior in 6 out of 8 ovariectomized rats (female control), but the mean MF was 2.8±0.7. Eight out of 12 ovariectomized rats which received a horizontal half-circle cut anterior to the anterior commissure (anterior roof deafferentation, ARD) with an L-shaped Halasz knife displayed mounting behavior more frequently and their MF was 14.5±5.1. The latent period between the introduction of a receptive female and the occurrence of the first mounting (mount latency, ML) in ARD rats was significantly shorter than that of the female controls. A half circle cut located posterior to the anterior commissure (posterior roof deafferentation, PRD) and sham deafferentation (SD) in the female rats had no effect on MF and ML.<BR>On the day following the last test for male behavior, all female rats were injected with 0.5mg progesterone in order to examine female sexual behavior. The mean lordosis quotient (LQ) of the ARD group was 62.5±13.4. In the female control, SD and PRD groups, however, LQs were significantly lower than that of ARD rats, being 15.1±10.9, 37.5±14.7 and 23.8±11.8, respectively. These results suggest that the dorsal inputs to the POA and hypothalamus which pass anterior to the anterior commissure may exert an inhibitory influence not only on the female sexual behavior mediating system but also on the mounting mediating system in female rats.

• 社団法人 日本内分泌学会の論文

著者

• Yamanouchi Korehito

  Department Of Human Behavior And Environment Sciences School Of Human Sciences Waseda University

• Yamanouchi Korehito

  Department Of Anatomy Juntendo University School Of Medicine

関連論文

• NUMBER OF SEROTONERGIC NEURONS IN MESENCEPHALIC RAPHE NUCLEI PROJECTING AXONS TO PREOPTIC AREA : IMMUNOSTAIN FOR RETOROGRADE TRACER AND SEROTONIN(Endocrinology,Abstracts of papers presented at the 75^ Annual Meeting of the Zoological Society of Japan)
• Potentiation of Ejaculatory Activity by Median Raphe Nucleus Lesions in Male Rats : Effect of p-Chlorophenylalanine
• Heterotypical Sexual Behavior in Male Rats : Individual Difference in Lordosis Response
• Mounting and Lordosis Behavior in Androgen Primed Ovariectomized Rats : Effect of Dorsal Deafferentation of the Preoptic Area and Hypothalamus
• Forebrain Lordosis Inhibiting System and Serotonin Neuron in Female Rats : Effect ofP-chloroamphetamine
• Female Lordosis Pattern in the Male Rat Induced by Estrogen and Progesterone: Effect of Interruption of the Dorsal Inputs to the Preoptic Area and Hypothalamus
• Effects of Hypothalamic Deafferentation on Hormonal Facilitation of Lordosis in Ovariectomized Rats
• Effect of Hypothalamic Deafferentation of Reserpine-Induced Lactogenesis in Female Rats
• Neural and Hormonal Control of Lordosis Behavior in the Rat

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