unmyelinated neuron

 Unmyelinated sheath

Unmyelinated nerve fibers Donot contain myelin sheath.

Grey in colour

Donot consist of nodes of ranvier

Speed of transmissions of nerve impulse is slow.

Include small axon neuron in CNS.

Short axon nerve fibers are unmyelinated.

Can loss of nerve impulse during conduction.

Non-myelinated nerve fibers; autonomic nervous system, somatic nervous system.