part of part of habenular trigone Wikipedia:Habenular_trigone trigonum habenulae neuronames:293 BTO:0002700 FMA:74868 BAMS:hbt superclass in BTO is thalamic nucleus, not present in most ontologies The habenular trigone is a small depressed triangular area situated in front of the superior colliculus and on the lateral aspect of the posterior part of the taenia thalami. It contains a group of nerve cells termed the ganglion habenulC&. Fibers enter it from the stalk of the pineal body, and others, forming what is termed the habenular commissure, pass across the middle line to the corresponding ganglion of the opposite side. Most of its fibers are, however, directed downward and form a bundle, the fasciculus retroflexus of Meynert, which passes medial to the red nucleus, and, after decussating with the corresponding fasciculus of the opposite side, ends in the interpeduncular ganglion. UBERON:0000445 trigone of habenulae diencephalon habenula regional part of brain