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Am J Physiol Regul Integr Comp Physiol 276: R441-R449, 1999;
0363-6119/99 $5.00
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Vol. 276, Issue 2, R441-R449, February 1999

Intracavernous pressure during erection in rats: an integrative approach based on telemetric recording

Jacques Bernabé1, Olivier Rampin1, Benjamin D. Sachs2, and François Giuliano3

1 Laboratoire de Neurobiologie des Fonctions Végétatives, Institut National de la Recherche Agronomique, F-78352 Jouy-en-Josas Cedex; 3 Groupe de Recherche en Urologie, Faculté de Médecine Paris-Sud, F-94270 Le Kremlin Bicêtre Cedex, France; and 2 Department of Psychology, University of Connecticut, Storrs, Connecticut 06269-1020

To better understand the similarities and differences in the neural control of penile erection occurring in different contexts, we recorded intracavernous pressure (ICP) in conscious rats using a miniaturized telemetric device. ICP changes during reflexive, noncontact, and apomorphine-induced erections were characterized by a plateau increase surmounted by peaks. Plateaus were also elicited by cavernous nerve stimulation in anesthetized rats, suggesting that the cavernous nerve represents the final common proerectile autonomic pathway in these contexts and that it responds similarly to information originating in the periphery or in supraspinal nuclei. During reflexive, noncontact, and apomorphine-induced erections, activation of spinal autonomic nuclei, considered the spinal generators of erection, would take place first, representing a prerequisite for the occurrence of peaks. Suprasystolic peaks would result from the addition of pudendal motoneuron activity. In contrast, only peaks were recorded during copulation. In this context, the convergence of peripheral and supraspinal information apparently elicits the best temporal arrangement of autonomic and somatic outflows, reflecting a highly organized and integrated spinal activity.

penis; sexual behavior; sexual reflexes; apomorphine; noncontact erections


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