Answer:
The correct answer to fill in the blank is: glial cells.
Explanation:
Glial cells are the other type of cells aside from neurons that are present in the nervous system.
Glial cells are present both in the Central Nervous System and the Peripheral Nervous System, but in each of these anatomical divisions, the glial cells differ. For example, in the Central Nervous System there are oligodendrocytes (form myelin), astrocytes (provides nutrition for the neurons, maintains the ionic balance, repairs the tissue after damage, and forms the blood-brain barrier), ependymal cells (produces cerebrospinal fluid), and microglia (a specialized macrophage); while in the Peripheral Nervous System there are only Schwann cells (form myelin) and satellite cells (provide nutrients for the neurons).
