Cooke et al (2007) discuss morphological differences in the medial amygdala (MeA) posterodorsal subnucleus (MeApd). The medial amygdala, according to Cooke et al, "is crucial in the expression of sex-specific social behaviors." Using electron microscopy, Cooke et al found that the left MeApd is larger in male rats than in female rats (both
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