part of part of overlaps preoptic periventricular nucleus median preoptic nucleus anteroventral periventricular nucleus diencephalic nucleus functional part of brain rostral periventricular region of the third ventricle RP3V UBERON:8440005 In rats and mice, the anteroventral periventricular nucleus plus the periventricular nucleus make up the rostral periventricular region of the third ventricle (RP3V). Overlaps is used (instead of has_part that this comment suggests should be used) as PMID:17604108 suggest that the region refers to cells that are scattered in the area. A functional anatomical construct containing the key estrogen-regulated inputs to gonadotropin-releasing hormone expressing (GnRH) neurons necessary for estrogen positive feedback. The rostral periventricular region of the third ventricle contains a population of neurons, scattered through the nuclei of the anteroventral periventricular (AVPV), periventricular preoptic (PVpo), and median preoptic (MEPO), that project directly to GnRH neurons and express ER-alpha. rostral periventricular region of the third ventricle