AXONE, the nerve fibre process of a neuron, which conducts away from the cell body (see DENDRITE, NEURON, SYNAPSE) . The axone is much longer than the dendrites, and also is frequently provided with a myelin sheath. Myelin is a fat-like material, white in colour ; hence the white matter of the central nervous system is composed of axone fibres. The peripheral process of a bipolar or unipolar neuron is sometimes called a "sensory axone," though this is a seeming contradiction to the direction of conduc tion by which axone is defined. An axone may have collateral branches, and usually has a diffuse branching at the end of the fibre, called its terminal arborization.