Neuron Structure Nerve cells are called neuron s. Neurons are generally divided into three parts. Dendrite conducts nerve impulses toward cell body. Cell body contains nucleus and other organelles of cell. Axon conducts nerve impulses away from cell body.
Nervous system consists of two main divisions.
Most long axons and dendrites are surrounded by neuroglial cells. Cell membranes contain myelin , an insulating lipid substance that gives nerve fibers their white color. Outermost sheath directs path for nerve to regenerate if severed. Inside Is Negative a. When axon is not conducting a nerve impulse, there is positive polarity outside and negative polarity inside axon membrane.