Another classification groups only the sensory fibers as Type I, Type II, Type III, and Type IV.Īn axon is one of two types of cytoplasmic protrusions from the cell body of a neuron the other type is a dendrite. These groups include both sensory fibers and motor fibers. Groups A and B are myelinated, and group C are unmyelinated. Nerve fibers are classed into three types – group A nerve fibers, group B nerve fibers, and group C nerve fibers. Axon dysfunction can be the cause of many inherited and acquired neurological disorders that affect both the peripheral and central neurons. In certain sensory neurons ( pseudounipolar neurons), such as those for touch and warmth, the axons are called afferent nerve fibers and the electrical impulse travels along these from the periphery to the cell body and from the cell body to the spinal cord along another branch of the same axon. The function of the axon is to transmit information to different neurons, muscles, and glands. An axon (from Greek ἄξων áxōn, axis), or nerve fiber (or nerve fibre: see spelling differences), is a long, slender projection of a nerve cell, or neuron, in vertebrates, that typically conducts electrical impulses known as action potentials away from the nerve cell body.
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