What role do glial cells play in the brain?

Glial cells play a crucial role in the brain primarily by providing support and nourishment to neurons. They are not directly involved in the transmission of electrical signals, as that function is primarily performed by neurons themselves. Glial cells help maintain the homeostasis of the neural environment, facilitate the repair process after injury, and ensure appropriate nutrient supply. They also assist in the formation of myelin, which is essential for the efficient transmission of nerve impulses.

While emotional regulation and memory storage are important brain functions, they are more intricately linked to neuronal activity and synaptic connections rather than the primary role of glial cells. Thus, the essential function of glial cells is to support and nourish neurons, making the option that highlights this role the most accurate.