Final answer:
Commissural fibers connect cortical regions on each side of the brain, such as the corpus callosum.
Step-by-step explanation:
The fibers that connect the cortical regions on one side of the brain with the corresponding cortical region on the other side of the brain are called commissural fibers.
One of the well-known examples of commissural fibers is the corpus callosum, a thick band of neural fibers consisting of about 200 million axons that allows the hemispheres of the brain to communicate with each other.
Other examples of commissural fibers include the anterior commissure and the posterior commissure.