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THE PHYSIOLOGY and ECOPHYSIOLOGY of EJACULATION Tropical and Subtropical Agroecosystems, Vol

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THE PHYSIOLOGY and ECOPHYSIOLOGY of EJACULATION Tropical and Subtropical Agroecosystems, Vol Tropical and Subtropical Agroecosystems E-ISSN: 1870-0462 [email protected] Universidad Autónoma de Yucatán México Lucio, R. A.; Cruz, Y.; Pichardo, A. I.; Fuentes-Morales, M. R.; Fuentes-Farias, A.L.; Molina-Cerón, M. L.; Gutiérrez-Ospina, G. THE PHYSIOLOGY AND ECOPHYSIOLOGY OF EJACULATION Tropical and Subtropical Agroecosystems, vol. 15, núm. 1, 2012, pp. S113-S127 Universidad Autónoma de Yucatán Mérida, Yucatán, México Available in: http://www.redalyc.org/articulo.oa?id=93924484010 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Tropical and Subtropical Agroecosystems, 15 (2012) SUP 1: S113 – S127 REVIEW [REVISIÓN] THE PHYSIOLOGY AND ECOPHYSIOLOGY OF EJACULATION [FISIOLOGÍA Y ECOFISIOLOGÍA DE LA EYACULACIÓN] R. A. Lucio1*, Y. Cruz1, A. I. Pichardo2, M. R. Fuentes-Morales1, A.L. Fuentes-Farias3, M. L. Molina-Cerón2 and G. Gutiérrez-Ospina2 1Centro Tlaxcala de Biología de la Conducta, Universidad Autónoma de Tlaxcala, Tlaxcala-Puebla km 1.5 s/n, Loma Xicotencatl, 90062, Tlaxcala, Tlax., México. 2Depto. Biología Celular y Fisiología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, México, D.F., México. 3Laboratorio de Ecofisiologia Animal, Departamento de Fisiologia, Instituto de Investigaciones sobre los Recursos Naturales, Universidad Michoacana de San Nicolás de Hidalgo, Av. San Juanito Itzicuaro s/n, Colonia Nueva Esperanza 58337, Morelia, Mich., México * Corresponding author ABSTRACT RESUMEN Different studies dealing with ejaculation view this Diferentes estudios enfocados en la eyaculación, process as a part of the male copulatory behavior. consideran a este proceso como parte de la conducta Some of them explain ejaculation as the consequence copulatoria masculina. Algunos de ellos explican la of a neuroendocrine feedback loops or from a purely eyaculación como la consecuencia de una anatomical perspective. The goal of the present review retroalimentación neuroendócrina o desde una is to discuss the traditional and novel themes related to perspectiva puramente anatómica. El objetivo de la the biology of ejaculation. The text begins with the presente revisión es discutir los temas tradicionales y description of the behavioral motor patterns that lead novedosos relacionados con la biología de la to ejaculation. The anatomo-physiological mechanisms eyaculación. El texto inicia con la descripción de los are explained under the notion that ejaculation is more patrones motores copulatorios que conducen a la than genitals and an excurrent duct system; thus it is eyaculación. Se explican los mecanismos anátomo- also included the participation of the striated perineal fisiológicos considerando que la eyaculación es más musculature. Although ejaculation is a sexual spinal que genitales y un sistema de ductos excurrentes; reflex, it is inhibited tonically by supraspinal entonces también se incluye la participación de la structures. Such supraspinal modulation may explain musculatura perineal estriada. Aunque la eyaculación the prudent sperm allocation, by which males adjust es un reflejo sexual espinal, está inhibido tónicamente the number of sperm per ejaculate while copulating por estructuras supraespinales. Tal modulación under distinct competitive scenarios. In some supraespinal puede explicar el reparto espermático mammals, ejaculate components facilitate seminal conveniente, por el cual los machos ajustan el número coagulation, an adaptation that may increase the male de espermatozoides por eyaculado al copular en reproductive fitness. Finally, there is a reflection of the distintos escenarios competitivos. En algunos so-called human ejaculatory disturbances, which from mamíferos, los componentes del eyaculado facilitan la an ecophysiolgical perspective could represent coagulación del semen, una adaptación que puede advantages instead of sexual malfunction as are incrementar el éxito reproductivo del macho. recognize under the medical view. Finalmente, se reflexiona sobre los llamados desórdenes eyaculatorios humanos, que desde la Keywords: Copulatory behavior; copulatory reflexes; perspectiva ecofisiológica podrían representar ventajas disorders of ejaculation; prudent sperm allocation; en lugar de disfunciones sexuales como son seminal characteristics; sexual reflexes; sperm reconocidas desde el punto de vista médico competition; sperm transport. Palabras clave: Conducta copulatoria; reflejos copulatorios; desórdenes de la eyaculación; reparto espermático conveniente; características seminales; reflejos sexuales; competencia espermática; transporte espermático. S113 Lucio et al., 2012 INTRODUCTION during copulation, an ex copula stimulation protocol has been devised in rats. During these tests, erections Ejaculation in mammals is a male sexual function are elicited by retracting the penile sheath while the design to inseminate the female. This ephemeral but male is kept in a supine position (Hart, 1968). The ex essential process occurs when the male reaches the copula and in copula penile erections are similar in ejaculatory threshold during the copulatory encounter. physiological terms (Hart, 1968; Holmes et al., 1991). In the present text ejaculation is analyzed in an However, the temporal pattern of penile reflexes integrative view, from proximal mechanisms to differs between natural and ex copula erections (Hart, ultimate explanations. Then ejaculation is considered 1968). Three gradations of erection can be observed: form a behavioral to ecophysiological perspectives. a) tumescence and elevation of the penile body without glans erection, b) intense erection of the glans COPULATORY BEHAVIOR: THE “cup” and of the penile body, and c) anteroflexions of EJACULATORY PRELUDE the penis due to the straightening of the penile body. During copulation cup formation is necessary for Male sexual behavior comprises activities aimed at depositing the semen into the vagina, where it inseminating the female and fertilizing her ova. In coagulates to form a solid seminal plug. Without this general, two components are accepted to constitute plug, much of the semen leaks out of the vagina and this sex behavior. The first component referred to as pregnancy rarely occurs (Sachs, 1982). These penile sexual drive, libido, courtship or appetitive aspect responses are present in “neutrally” intact rat males involves the behavioral expression used by males to (Dusser de Barenne and Koskoff, 1932; Hart, 1968). gain access to the female (e.g., fighting for territory, Also, penile reflexes may be elicited from spinally advertising his physical attributes or providing food to transected humans (Zeitlin et al., 1957). This indicates females). The second component is known as that penile reflexes are organized substantially at the performance, potency or consummatory aspect, and spinal level. Reflexes are, nonetheless, subjected to corresponds when copulation occurs. Males spent considerable supra-spinal control (Beach, 1967). much more time and energy seeking for copulation than the actual time and energy used to copulate Seminal expulsion refers to the forceful discharge of (Sachs and Meisel, 1988). semen from the prostatic urethra through the urethral meatus. Ejaculation is elicited by urethral distention Copulatory motor patterns and copulatory genital and results from the clonic contraction of the responses ischiocavernosus and bulbocavernosus muscles in response to the rhythmic firing of the cavernous nerve. The male copulatory behavior is expressed as motor This response is called the urethrogenital reflex and it patterns commonly organized in series of mounts, can be observed in rats that have high spinal intromissions and ejaculation. In almost all mammals, transection. A cluster of serotonergic neurons in the the male mounts the female dorsally and from the rear. brain stem is implicated in the descending inhibition of Males’ mounts features pelvic movements (i.e., spinal sexual reflexes (Marson and McKenna, 1990). thrusts) and flank palpation (Sachs and Garinello, The urethrogenital reflex is used as a model to study 1978). Intromission occurs when the penis enters the penile erection and ejaculation (McKenna et al., vagina following a mount. Penile insertion may entail 1991). only a brief genital contact with immediate ejaculation (ungulates; Bermant et al., 1969; Lott, 1981), it may EJACULATION: THE MALE´S AIM consist of a single long connection (canids; Beach, 1969) or it may be an extended series of brief genital Ejaculation is defined as the expulsion of seminal fluid contacts as in before ejaculation is reached (rodents; from the urethral meatus. It involves coordinated Larsson, 1956). Ejaculation occurs when the inserted series of reflexes activated during its two phases: penis into the vagina expel seminal fluid via the emission and expulsion. urethral meatus. Ejaculation in male rats is the culmination of vigorous intravaginal pelvic thrusting Seminal emission refers to the secretion of seminal accompanied by the arching of the male’s spine and plasma from the accessory sexual glands as the results the lifting of his forepaws off the female prior to of the peristaltic contraction of their smooth muscles; withdrawal. After ejaculation, the male dismount is the transferring of seminal plasma and spermatozoa followed by penis auto-grooming
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