All the nerve fibres carry information in the form of the nerve impulse.
The nerve impulse is the sum total of physical and chemical disturbances created by a stimulus (electrical, chemical or mechanical) in a neuron or nerve fibre which results in the movement of a wave along the nerve fibre.
The nerve fibre or axon is like a cylinder.
The interior of the axon is filled with axoplasm (i.e., the cytoplasm of the nerve cell)
The exterior of the axon is covered with a thin membrane, the axon membrane or axolemma.
Axolemma is selectively permeable for eimple organic and inorganic molecules