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Perirhinal cortex lesions delay ejaculation in rats.

Kartavya Sharma¹, Kamalesh K Gulia, Velayudhan Mohan Kumar

¹Department of Physiology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi 110029, India.

Behavioural Brain Research

|January 22, 2008

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The perirhinal cortex (PRh) plays a facilitatory role in male rat sexual behavior. Lesioning the PRh delayed ejaculation and increased the time between mating attempts.

Area of Science:

Neuroscience
Behavioral Neuroscience
Rodent Sexual Behavior

Background:

The hippocampal formation is implicated in sexual behavior.
The perirhinal cortex (PRh) is a major input to the hippocampus.
The specific role of the PRh in sexual behavior remains understudied.

Purpose of the Study:

To investigate the role of the perirhinal cortex (PRh) in male rat sexual behavior.

Main Methods:

Bilateral neurotoxic lesions were performed on the perirhinal cortex (PRh) in male rats.
Ejaculation latency and inter-intromission intervals were measured.

Main Results:

Bilateral lesions of the perirhinal cortex (PRh) significantly delayed ejaculation latency.

Related Experiment Videos

The mean inter-intromission interval was significantly prolonged following PRh lesions.

Conclusions:

The perirhinal cortex (PRh) appears to facilitate male rat sexual behavior.
These findings highlight a novel role for the PRh in the neurobiology of sex behavior.