Final answer:
Glial cells are the cells in the nervous system responsible for insulating, nourishing, and removing waste from neurons, not the cerebellum, corpus callosum, or cerebral hemispheres.
Step-by-step explanation:
The cells found in the nervous system that insulate, nourish, and remove waste products from neurons are none of the large structures listed (a - the cerebellum, b - the corpus callosum, c - the left hemisphere, d - the right hemisphere), but rather a type of cell known as glial cells. These cells are crucial for the health and function of the nervous system. Among the types of glial cells, astrocytes regulate the chemical environment of the neuron, oligodendrocytes insulate the axons which allows efficient transmission of electrical impulses, and other glial cells are involved in transporting nutrients and waste products. Some glial cells are also phagocytic, meaning they can ingest and remove debris or damaged cells from nervous tissue.