Unipolar neurons (pseud-unipolar) are sensory neurons. They may be found in dorsal root ganglia, and ganglia of cranial nerves. Some locations where bipolar neurons exist are retina of the eye, olfactory epithelium and the vestibulocochlear nerve. Multipolar neurons are the most common in the nervous system.. Examples are Purkinje cells of the cerebral cortex, spinal motor neurons. and pyramidal neurons.
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True unipolar neurons do not exist in humans, although the unipolar brush cell has a single process. The pseudo-unipolar neuron of humans is the most common sensory neuron. The cell body grows a single axon which divides into peripheral and central branches. The peripheral branch picks up sensory stimuli like touch or temperature, and transmits them to the central branch The central branch carries stimuli into the CNS.. (Some of these neurons do sprout dendrites from their peripheral branch but not directly from the soma). This type of neuron exists in cranial and spinal nerve ganglia Bipolar neurons grow an axon and one main dendrite from the cell body. These neurons are not very common. They are found in the retina of the eye and in the olfactory region of the brain. Multipolar neurons have one axon and many dendrites (30 or more). This is the most common type of neuron in the body.