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

K. Yamanouchi, Y. Arai

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    Lordosis behavior was very rare in castrated male rats which had been pretreated with 50 μg estradiol benzoate (EB) for successive 2 days and 1 mg progesterone (P) 6-8 hr prior to testing on the third day. Only one out of 8 rats displayed lordosis in response to mounts by the sexually matured males. However, the occurrence of lordosis behavior was markedly increased in similarly treated castrated males in which the dorsal afferents to the preoptic areas (POA) and hypothalamus were removed by the surgical cut. Twelve out of 19 rats of the group showed lordosis response. The incidence was less frequent in rats receiving sham deafferentation. These results suggest that the dorsal inputs to the POA and hypothalamus may exert a tonic inhibitory influence on the lordosis mediating system in the male rat.

    Original languageEnglish
    Pages (from-to)243-246
    Number of pages4
    JournalEndocrinologia Japonica
    Issue number3
    Publication statusPublished - 1975


    ASJC Scopus subject areas

    • Endocrinology

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