Estrogen Effects on the Synaptology and Neural Membranes of the Rat Hypothalamic Arcuate Nucleus1

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Abstract
The concept of estrogen-induced "sexual differentiation of the brain" has been a useful focus for investigation. However, it has become clear that the action of estrogen on the rat brain is lifelong, including effects on neurogenesis in the fetus, synaptogenesis in the newborn, and synaptic remodeling in the adult. Estrogen imparts sex differences in the rat's brain by shaping synaptology, postsynaptic membranes, and glia within the arcuate nucleus. These effects of estrogen on the arcuate nucleus also could underlie sexual maturation in both sexes and the development of senescent constant estrus in females.

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