棕色田鼠和沼泽田鼠脑内部结构性二型的比较研究

Comparison of the sexual dimorphism of brain structure between mandarin vole (Microtus mandarinus) and reed vole (M. fostis)

对棕色田鼠和沼泽田鼠大脑中央视前区、终纹床核、杏仁核、大脑皮层、扣带回、海马、齿状回等进行了测量和比较,结果发现,雌雄沼泽田鼠终纹底核、杏仁核和中央视前区的差异,比棕色田鼠两性间更为显著,而棕色田鼠大脑皮层和海马显著大于沼泽田鼠．大脑皮层和海马是参与记忆痕迹的结构,且大脑皮层又与社会行为有关．因此,推测棕色田鼠和沼泽田鼠性二型的差异可能与两种田鼠的婚配制度有关．

In order to study the relationship between brain structure and animal behaviors, especially mating system, the degrees of sexual dimorphism in some brain area such as medial .preoptic area （MPA） ,bed nucleus of stria terminalis（BST）, the amygdaloid complex, Cerebral cortex（Cc） , the field CA1, CA2, CA3 and CA4 of Ammon＇s horn, cingulum （Cg） and dentate gyrus were compared between monogamous mandarin vole （Microtus mandarinus ） and polygamous reed vole（ M. fostis ）. The reed vole show more significant sexual difference in the medial preoptic area, bed nucleus of stria terminalis （BNST） and the amygdaloid complex than mandarin vole. The Cerebral cortex and the field CA1 .CA2.CA3 of hippocampus of mandarin voles are significantly larger than reed vole. For Cerebral cortex and the field CA1 ,CA2 .CA3 of hippocampus are very important for animal social behaviors and memory, It is suggested that neuroanatomical dimorphisms in brain may be related to sex differences in behavior and mating system.