part of start stage end stage habenula ventral habenular nucleus Habenular nucleus positioned ventromedially to the dorsal habenular nuclei. The ventral habenular nuclei are paired and symmetrical, each have a conical shape defined by a wide rostral end, occupying the entire anterior region of the habenula, and a narrow caudal end. The axons of the ventral habenular nucleus passed laterally through the interpeduncular nucleus and projected to the ventral part of the median raphe. The ventral habenular nucleus is homolog mammalian lateral habenular nucleus. zebrafish_anatomy ZFA:0000302 TAO:0000302 brain nucleus unknown adult