L21-SexualBehaviorII

L21-SexualBehaviorII - Sexual Behavior II Hormonal Control...

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Sexual Behavior II Hormonal Control of Sexual Behavior o Activational effect of E and P in nonandrogenized animal: Female sexual behavior when rat receives E and P as an adult and nothing at birth o Defeminization: Even after receiving E and P at adult stage, if animal received testosterone at birth, female sexual behavior will not result o Masculinization: After receiving testosterone at birth, receiving testosterone as an adult facilitates male sexual behavior Neural Control of Sexual Behavior in MALES o Medial Preoptic Area (MPA) Nucleus appears different in males and females of different species Prenatal stress reduces the size of this nucleus (sexually dimorphic nucleus) Destruction abolishes sexual behavior; prenatal stress decreases sexual behavior Mating causes production of Fos protein Size depends on testosterone level; if not received at birth, the nucleus is smaller than normal Neural Control of Sexual Behavior in FEMALES o Ventromedial Nucleus of Hypothalamus (VNH) o Medial amygdale Sexual Behavior: Summary o Hormones play two roles Organizational: Prenatal exposure to androgens masculinize sex organs and brain structures Activational: exposure to sex hormones in adulthood leads to the expression of sexual behavior Initial brain organization is more important than the injection of
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This note was uploaded on 04/09/2008 for the course PSYC 220 taught by Professor Brunges during the Spring '07 term at UVA.

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L21-SexualBehaviorII - Sexual Behavior II Hormonal Control...

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