Classification of Neurons

Sensory/Afferent Neurons

neurons carrying impulses from sensory receptors to the CNS

receptors

dendrite endings of the sensory neurons are usually associated with specialized receptors activated by specific changes, pain receptors are the least specialized and most numerous

motor/efferent neurons

neurons carrying impulses from the CNS to the muscles/glands, always located in the CNS

multi-polar neuron

processes extending from the cell body, most common structural type (all motor and most association neurons)

bipolar neurons

two processes (an axon and a dendrite), rare in adults and found in only some special sense organs (eye, ear)

unipolar neuron

single process emerging from the cell body, sensory organs found in the PNS ganglia are unipolar