nevertheless , the distributions of sp-positive fibers in the regions of the brain other than the neurohypophysis were very similar between the two species : sp-positive fibers were found at many locations of the brain , and were especially rich in the periventricular subependymal zone of the ventral telencephalon and in the diencephalon , preoptic area , hypothalamus , and interpeduncular nucleus .
C0012144
diencephalon
C0020663
hypothalamus