part of start stage end stage rostral parvocellular preoptic nucleus rostral parvocellular preoptic nuclei ZFA:0000426 TAO:0000426 anterior parvocellular preoptic nucleus Diencephalic nucleus that is part of the preoptic area and is the anterior continuation of the caudal parvocellular preoptic nucleus and is ventral to the telencephalon. From Neuroanatomy of the Zebrafish Brain. zebrafish_anatomy preoptic area parvocellular preoptic nucleus unknown adult