Final answer:
Neurons in Wernicke's area send impulses to Broca's area via association fibers, which connect regions within the same hemisphere and are crucial for language function.
Step-by-step explanation:
When neutrons in Wernicke's area send impulses to neurons in Broca's area, the white matter tracts utilized are association fibers. These fibers connect different regions within the same hemisphere of the brain. In the context of language function, Wernicke's area is associated with language comprehension, whereas Broca's area is associated with language production. The connection between these two areas is crucial for the coordination of understanding speech and producing coherent speech. Therefore, the correct answer to the question is association fibers.