Fiber anatomy of dorsal and ventral language streams

► MR data and fiber dissection studies show anatomically defined fiber tracts composing ventral and dorsal language streams. ► The major fiber tract of the dorsal stream is the arcuate fasciculus. ► The major tract of the ventral stream is the inferior fronto-occipital fasciculus. ► There are considerable differences in fiber architecture between the monkey and the human brain. ► Polarized light imaging reproduces the described fiber architecture of these pathways with higher detail.