Association Fibersare white matter fibers which connect :
Association fibers: Connect different cortical areas in the same hemisphere
Projection Fibers: Connect cerebral cortex with lower level in brain (Eg. Brainstem, spinal cord)
Commissural fibers: Connect corresponding areas in the two cerebral hemispheres
Corresponding areas in two cerebral hemisphere
Cerebral cortex with lower level in brain
Different cortical areas in the same hemisphere
Different cranial nerve nuclei