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The density of cells in the anteroventral periventricular nucleus (AVPv) of the preoptic area of female rats was greater than that of males on day 21 of gestation. It appears that this difference between the sexes is caused by the action of androgen since the density of cells in the AVPv of female fetuses fell to the density in males when the mother(More)
The neurons in the hypothalamic arcuate nucleus (ARC) of 20-day-old female mice were examined by electron microscopy. The administration of estradiol-17 beta during 20 days from the day of birth resulted in the increase of dense-core vesicles (DCVs) in some neuronal perikarya of the middle region of the ARC (middle ARC), while, in the posterior region of(More)
Immunoreactivity specific to keratan sulfate (KS), heparan sulfate (HS), and chondroitin sulfate (CS) in the nasal region of chick embryos on embryonic day (ED) 3.5-7, was investigated with six antibodies and three glycosidases. Immunoreactivity specific to HS, KS, and CS, and their localized distribution was seen in the olfactory epithelium, olfactory(More)
Nuclear volume of the medial and lateral nuclei of the amygdala was investigated in male and female rats. The volume of the medial nucleus in the adult male rat was significantly greater than that of the female rat. Treatment of female rats with estrogen for the first 30 days of postnatal life increased the nuclear size, and the volume became comparable to(More)
The existence of sexual dimorphism in synaptic pattern is demonstrated in the molecular layer of the medial nucleus of the rat amygdala by semiquantitative electron microscopic analysis on synaptic density. Sex difference in synaptic number was found in dendritic shaft synapses in the medial part of the molecular layer, whereas the difference occurred in(More)
Following lesion of the posterior cortical nucleus of the amygdala (PCAN), the number of degenerating axon terminals and alterations of synaptic pattern were studied in the molecular layer (ML) of the medial nucleus of the amygdala (MAN) of male and female rats. Semiquantitative analyses by electron microscopy indicated that, 1 and 2 days after the lesion,(More)
Perinatal treatment of female rats with androgen decreases the nuclear volume of the anteroventral periventricular nucleus of the preoptic area (AVPvN-POA). In order to examine the effect of androgen on neurogenesis, bromodeoxyuridine (BrdU) was given once on Day 15 of gestation (= E15) to pregnant rats that also received testosterone propionate (TP)(More)
Estrogen markedly promotes the specific formation of dendritic shaft synapses in the medial amygdaloid nucleus (AMN) of the rat when given in early postnatal days. The high incidence of this type of synapse permanently persists until sacrifice at adult ages. The data provide evidence for the synaptic plasticity of the developing amygdala to estrogen and(More)
Kindling stimulation was given in the basolateral amygdala (BLA), the septal area or the corpus callosum in the right hemisphere of adult rats. The density of dendritic synapses was electron microscopically studied in the medial amygdaloid nucleus (MAN) ipsi- and contralateral to the stimulation side. The number of dendritic synapses was markedly decreased(More)