Supportive cells, also known as glial cells, play a crucial role in the nervous system. Unlike neurons, which transmit signals, supportive cells provide structural support, nourishment, and protection to neurons. They help maintain the environment around neurons, ensuring they function properly. There are several types of supportive cells, including astrocytes, microglia, and oligodendrocytes. Astrocytes help regulate blood flow and nutrient supply, while microglia act as the immune cells of the brain, removing debris and pathogens. Oligodendrocytes are responsible for forming the myelin sheath, which insulates neuronal axons and enhances signal transmission.