““Remarkably, the size of neurons’ dendritic trees in the hippocampus expands and contracts like an accordion throughout a female rat’s ovulatory cycle, with the size (and her cognitive skills) peaking when estrogen peaks.fn6 Thus, neurons can form new dendritic branches and spines, increasing the size of their dendritic tree or, in other circumstances, do the opposite; hormones frequently mediate these effects.””
