The preoptic area is a region of the hypothalamus. According to the MeSH classification, it is considered part of the anterior hypothalamus. There are four nuclei in this region, according to Terminologia Anatomica (Medial, Median, Lateral, and Paraventricular) [Wikipedia: http://en.wikipedia.org/wiki/Preoptic_area].
Hierarchy: 5
Parent: hypothalamus
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