Nervous Tissue: Spinal Cord Motor Neuron Every time you remember a name, learn something new, or drift off to sleep, two types of brain cells are working together: neurons and glia. Neurons: The Signal Carriers Neurons are the cells responsible for communication. You’ve probably heard the phrase, “Neurons that fire together, wire together.” A typical neuron has three main parts: the soma (cell body with the nucleus and organelles), dendrites (branches that receive signals fr