Commissural fibers of telencephalon

The commissural fibers of commissural fibres of telencephalon (transverse fibers of telencephalon) are axons that connect an area in one hemisphere of the brain with an area in the opposite hemisphere. 

The commissural fibers make up tracts that include:

• The corpus callosum is the largest set of commissural fibers in the brain and is a pathway of crucial importance to speech-language functions.
• The anterior commissure connects the olfactory bulbs, amygdaloid nuclei, and the medial and inferior temporal lobes.
• The hippocampal commissure (commissure of fornix) is fibers that connect contralateral hippocampi via the crura of the fornix and run beneath the posterior portion of the corpus callosum.