<P> A unipolar neuron is a type of neuron in which only one protoplasmic process (neurite) extends from the cell body . Most neurons are multipolar, generating several dendrites and an axon and there are also many bipolar neurons . Unipolar neurons that begin as bipolar neurons during development are known as pseudounipolar neurons . </P> <P> Unipolar neurons are common in insects, where the cell body is often located at the periphery of the brain and is electrically inactive . These cell bodies often send a single neurite into the brain; however, this neurite may ramify into a large number of branches making a very complex set of connections with other neurites, in regions of neuropil . </P> <P> Unipolar brush cells are neurons specific to the cerebellum and the granule region of the dorsal cochlear nucleus . </P> <P> In all species, including vertebrates and invertebrates, many types of primary sensory neurons are pseudounipolar . Typically these have special structures for transducing some type of physical stimulus (light, sound, temperature, etc .) into electrical activity, no dendrites, and a single axon that conveys the resulting signals into the spinal cord or brain . </P>

Where are unipolar neurons found in the human body