Role of the archistriatal nucleus taeniae in the sexual behavior of male Japanese quail (Coturnix japonica): a comparison of function with the medial nucleus of the amygdala in mammals

Brain, Behavior and Evolution
R R ThompsonElizabeth Adkins-Regan

Abstract

Nucleus taeniae (Tn) is a prominent cell group within the medial archistriatum of birds. Based upon similarities in sex-steroid binding sites, this nucleus has been hypothesized to be homologous to the medial nucleus of the amygdala (Me) in mammals, which is known to modulate the expression of sexual behavior in rodents. We therefore tested whether or not Tn likewise plays a role in the expression of sexual behavior in male Japanese quail. We found that bilateral damage to Tn produced deficits in several components of male responses toward female stimuli that were indicative of decreased sexual arousal, including goal-oriented responses, vocalizations associated with courtship, and motor reflexes that precede copulation. Our results suggest that Tn influences a wide range of behavioral functions in response to sexual stimuli, and they indicate a function for this nucleus similar to that subserved by the Me in mammals. These results strengthen the argument that these sex-steroid accumulating cell groups are homologous and suggest a conservation of function for them despite the vastly divergent evolutionary histories separating birds and mammals.

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