Hormones, brain and behavior by Pfaff D.W., et al. (eds.)

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By Pfaff D.W., et al. (eds.)

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2005). , 2003). Adult males had an increase in the major metabolite 3,4-dihydroxyphenylacetic acid (DOPAC) in punches from the mPOA in response to vaginal secretions from female hamsters. The increase in DOPAC is taken as evidence that DA was released, transported back into the axon terminal, and metabolized. Juveniles showed no such increase and were also unable to copulate. DA release in the mPOA is regulated by NO. , 1996) extracellular DA levels were dependent on NOS activity. As noted above, T and E positively regulate NOS-ir in the mPOA.

2001). No 2-day T-treated castrate could copulate or show a DA response; eight of nine 5-day T-treated castrates copulated and showed a DA response, with five of the eight able to ejaculate. All of the 10-day T-treated castrates copulated and all showed the DA response. There were numerous correlations between DA levels and copulatory measures. Therefore, both the loss of copulation following castration and its restoration by T are closely associated with the femaleelicited DA response in the mPOA.

2003). , 2008). 2(i) Anatomy There is controversy about whether the amygdala should be regarded as a single entity or a collection of nuclei that contribute to learning, motivation, and fear (central nucleus and basolateral division) or to chemosensory processing and social behaviors (corticomedial division) (Swanson and Petrovich, 1998). Clearly, the corticomedial region is very important for male rodent sexual behavior, serving as an integration site for chemosensory, somatosensory, and hormonal stimuli and projecting to the mPOA and other central regulatory areas.

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