Other axons arising from these cells descend through the medial forebrain bundle to terminate in a region dorsal to the interpeduncular nucleus.
2.
By way of the fasciculus retroflexus ( habenulointerpeduncular tract ) it projects to the interpeduncular nucleus and other paramedian cell groups of the midbrain tegmentum.
3.
The medial habenula sends outputs of glutamate, substance P and acetylcholine to the periaqueductal gray via the interpeduncular nucleus as well as to the pineal gland.
4.
Most of the trigonum habenul?s 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 nucleus.
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