Final answer:
The term for a group of axons connecting the cerebrum and brain stem is the corpus callosum. It serves as the main avenue of communication between the two hemispheres of the cerebrum.
Step-by-step explanation:
The term for a group of axons connecting the cerebrum and brain stem is the corpus callosum. It is a thick bundle of axons that lies deep within the brain and serves as the main avenue of communication between the two hemispheres of the cerebrum. It connects each point in the cerebrum to the mirror-image point in the opposite hemisphere.