For the spinal cord though, we can say that there are three types of neurons: sensory, motor, and interneurons. So just how many types of neurons are there? And how do scientists decide on the categories? For neurons in the brain, at least, this isn’t an easy question to answer. Just from looking down a microscope, however, it becomes very clear that not all neurons are the same. They are the fundamental units that send and receive signals which allow us to move our muscles, feel the external world, think, form memories and much more. Neurons are the cells that make up the brain and the nervous system.
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