Neurons are specialized cells that produce and conduct “impulses,” or nerve signals. Neurons consist of a cell body, which contains a nucleus and two types of cytoplasmic extensions, dendrites, and axons. Dendrites are thin, highly branched extensions that receive signals. Axons are tubular extensions that transmit nerve impulses away from the cell body, often to another neuron. Nerve tissue also has supporting cells, called neuroglia or glial cells, which nourish the neurons, insulate the dendrites and axons, and promote quicker transmission of signals.