The Commissura fornicis (Psalterium) is a Commissural fiber bundle of the Fornix in the telencephalon and part of the limbic system.
Anatomy
On the inferior surface of the Corpus callosum, the two crura fornicis unite to form the Commissura fornicis and thus form the Corpus fornicis, which divides again above the Foramen of Monro into two Columnae fornicis[^1].