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The role of mounts and intromissions in triggering ejaculation in rats

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Beck J., Bialy M.
Acta Neurobiologiae Experimentalis
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2000
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vol. 60
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issue 1
29-33
EN
Eight male rats copulated with an estrus female with an open vagina (NF) and an estrus female with the vagina covered by adhesive tape (CF). Experimental sessions were composed of two phases. During Phase 1 the males copulated with NF or with CF females until 4 intromissions or 4 mount bouts were displayed respectively. In Phase 2 the males copulated alternately with NF or CF according to three schedules: (1) a sequence two mount bouts with a CF female followed by one intromission, (2) a sequence one intromission followed by two mount bouts with a CF female , and (3) a sequence one intromission followed by four mount bouts with a CF female. All of these sequences were repeated until ejaculation. Ejaculation occurred in 95.8% of cases within one minute after the last intromission during copulation with the CF female. The results of this study indicate that: (1) the number of intromissions displayed during Phase 2 does not depend on the character of the copulatory behaviour displayed during Phase 1, (2) at least two intromissions are displayed before ejaculation, and (3) the tactile stimulation of the glans of penis plays a crucial role in the ejaculatory seminal reflex.
2
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c-fos expression as tool to search for the neurobiological base of the sexual behaviour of males

100%
Bialy M., Kaczmarek K.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 2
567-577
EN
Elevated expression of c-fos mRNA and/or its protein (c-Fos) has been repeatly observed following activation of brain cells with various stimuli.As a consequence it has been proposed that elevated c-fos expression may serve as a merker of neuronal activation reflecting a prediposal to a long-term changes in cell functioning (neuronal plasticity).It studies on copulatory behaviour of male animals, elevated Fos immunoreactivity (related most probably to c-Fos) has been used by many researchers as a tool to reveal functional neuroanatomy of the behaviour.They found that brain regions such as medial preoptic area (MPOA), bed nucleus of stria terminalis (BNST), medial amygdala (MeAm) and central tegmental field (CTF) are always activated in a copulation-dependent manner in various species (rats and hamsters were the most often studied in this regard).This paper reviews the data gathered in this field, and discusses them in the context of the role of elevated Fos expression in acquisition vs. performance of the sexual behaviour.
3
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The role of sexual reward in the temporal patterning of copulatory behaviour in male rats

100%
Beck J., Bialy M.
Acta Neurobiologiae Experimentalis
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1993
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vol. 53
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issue 3
451-456
EN
In 8 male rats instrumental responses reinforced by contact with an estrous female with an intact or a surgically closed vagina were investigated. Contact with the female lasted until the end of the mount bout. It was observed that neither the rewarding value of the mount bout (expressed by the duration of the response) nor its arousing properties (expressed by the rate of bar presses) depended on the quality (mounts or intromissions) or quantity of the copulatory events of which it was composed. It is suggested that the temporal patterning of in male rats depends on fluctuations of . This sexual reward can be a result of both genital stimulation as well as the performance of mounting under the influence of sign stimuli coming from the estrous female.
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