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Full-Text Articles in Life Sciences
Contextual Modulation Of Social And Endocrine Correlates Of Fitness: Insights From The Life History Of A Sex Changing Fish, Devaleena S. Pradhan
Contextual Modulation Of Social And Endocrine Correlates Of Fitness: Insights From The Life History Of A Sex Changing Fish, Devaleena S. Pradhan
Neuroscience Institute Faculty Publications
Steroid hormones are critical regulators of reproductive life history, and the steroid sensitive traits (morphology, behavior, physiology) associated with particular life history stages can have substantial fitness consequences for an organism. Hormones, behavior and fitness are reciprocally associated and can be used in an integrative fashion to understand how the environment impacts organismal function. To address the fitness component, we highlight the importance of using reliable proxies of reproductive success when studying proximate regulation of reproductive phenotypes. To understand the mechanisms by which the endocrine system regulates phenotype, we discuss the use of particular endocrine proxies and the need for …
Anatomy And Physiology Of The Nucleus Paragigantocellularis: Neural Regulation Of Genital Reflexes In Male And Female Rats, Joseph Jeremy Normandin
Anatomy And Physiology Of The Nucleus Paragigantocellularis: Neural Regulation Of Genital Reflexes In Male And Female Rats, Joseph Jeremy Normandin
Biology Dissertations
The supraspinal control of descending inhibition of genital reflexes (such as ejaculation) is poorly understood but is important in our global comprehension of how neural signals are integrated to produce sexual behavior, and in our understanding of sexual dysfunction. Sexual dysfunctions, such as premature ejaculation/delayed ejaculation in men, and involuntary vaginal spasms, dyspareunia, and anorgasmia in women, are common. An underlying dysregulation of genital reflexes may produce these dysfunctions, especially in those individuals being treated for depression and anxiety with serotonergic drugs. The nucleus paragigantocellularis (nPGi) of the rat medulla has been described as a descending inhibitory system for genital …
Nucleus Paragigantocellularis Afferents In Male And Female Rats: Organization, Gonadal Steroid Receptor Expression, And Activation During Sexual Behavior, Joseph J. Normandin, Anne Z. Murphy Phd
Nucleus Paragigantocellularis Afferents In Male And Female Rats: Organization, Gonadal Steroid Receptor Expression, And Activation During Sexual Behavior, Joseph J. Normandin, Anne Z. Murphy Phd
Neuroscience Institute Faculty Publications
The supraspinal regulation of genital reflexes is poorly understood. The brainstem nucleus paragigantocellularis (nPGi) of rats is a well-established source of tonic inhibition of genital reflexes. However, the organization, gonadal steroid receptor expression, and activity of nPGi afferents during sex have not been fully characterized in male and female rats. To delineate the anatomical and physiological organization of nPGi afferents, the retrograde tracer Fluoro-Gold (FG) was injected into the nPGi of sexually experienced male and female rats. Animals engaged in sexual behavior 1 hour before sacrifice. Cells containing FG, estrogen receptor-α (ERα), androgen receptor (AR), and the immediate-early …
Social Interactions Of Lythrypnus Dalli And Their Effects On Aggression, Neuropeptides, Steroid Metabolism, And Sex-Typical Morphology, Michael Paul Black
Social Interactions Of Lythrypnus Dalli And Their Effects On Aggression, Neuropeptides, Steroid Metabolism, And Sex-Typical Morphology, Michael Paul Black
Biology Dissertations
Social interactions can have profound effects on the behavior, physiology, and overall fitness of an individual. An example of this in Lythrypnus dalli is the removal of a male from a social group resulting in a dominant female fish changing sex. The dominant female's transformation involves a suite of changes including brain, behavior, morphology, and physiology. Following the social trigger (male removal), sex-changing individuals' morphology, steroid levels, and changes in the behavior were quantified in the field and compared to results found previously in the laboratory. There were lower rates of aggressive and courtship behavior in the field, but the …