ⓘ Unipolar neuron. A unipolar neuron is a type of neuron in which only one process called a neurite extends from the cell body. Most neurons are multipolar, gener ..

                                     

ⓘ Unipolar neuron

A unipolar neuron is a type of neuron in which only one process called a 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.

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 many branches making a very complex set of connections with other neurites, in regions of neuropil.

In mammals, unipolar brush cells are neurons that are specific to the cerebellum, and the granule region of the dorsal cochlear nucleus.

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 into electrical activity, no dendrites, and a single axon that conveys the resulting signals into the spinal cord or brain.

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