Final answer:
The right and left halves of the forebrain are connected by the corpus callosum, which is a thick bundle of myelinated axons facilitating communication between the two cerebral hemispheres.
Step-by-step explanation:
The right and left halves of the forebrain are connected by sets of white matter fibers, known as myelinated axons. These white matter fibers are collectively called the corpus callosum, a thick bundle of axons that lies deep within the brain and enables communication between the two hemispheres. Each hemisphere of the cerebrum corresponds to the side of the body opposite to it and is responsible for various cognitive and motor functions.