Abstract
By using an in vitro tract-tracing technique, the neural connections between two diencephalic cell groups, the posterior subdivision of the nucleus preopticus periventricularis (PPp) and the preglomerular nucleus (PG), was examined in the weakly electric gymnotiform fish Apteronotus leptorhynchus. Neurons of the PPp project to one area within PG, the ventromedial cell group of the medial subdivision of the preglomerular nucleus (PGm-vmc). Axons of these cells reach the ipsilateral PGm-vmc via the basic hypothalamic tract, while collaterals decussate via the postoptic commissure to innervate the contralateral PGm-vmc. We hypothesize that those neurons within PPp that project to the PGm-vmc are homologous to neurons of the medial preoptic area of mammals. As part of an elaborate circuit, PPp and PG may participate, as in mammals, in the control of complex social behavior patterns.
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