Unipolar neuron

A unipolar neuron is a type of neuron in which only one neurite extends from the cell body. This single process often branches into two distinct structures: one functioning as a dendrite and the other as an axon. Unipolar neurons are primarily found in the nervous system of invertebrates, although they also appear in the dorsal root ganglia of vertebrates.

Diagram showing different types of neurons, including unipolar neurons.

Structure

Unipolar neurons are characterized by their unique structure, which distinguishes them from other types of neurons such as bipolar and multipolar neurons. The single process that emerges from the cell body divides into two branches: one that extends towards the central nervous system and another that extends towards the periphery. This configuration allows unipolar neurons to efficiently transmit sensory information from the periphery to the central nervous system.

Function

Unipolar neurons are primarily involved in the transmission of sensory information. They are commonly associated with the somatosensory system, where they play a crucial role in conveying information about touch, temperature, and pain from the body to the brain. The unique structure of unipolar neurons allows for rapid signal transmission, which is essential for the quick processing of sensory stimuli.

Distribution

In vertebrates, unipolar neurons are predominantly found in the dorsal root ganglia, where they serve as primary sensory neurons. In invertebrates, such as arthropods and annelids, unipolar neurons are more widespread and can be found throughout the nervous system.

Unipolar neurons in the nervous system of an onychophoran.

Related Pages

• Neuron
• Bipolar neuron
• Multipolar neuron
• Dorsal root ganglion
• Somatosensory system

References

• Eric R.,

 Principles of Neural Science, 
  
 McGraw-Hill, 
 2013, 
  
  
 ISBN 978-0071390118,

• Purves, Dale."Neuroscience".Sinauer Associates.2012;5th edition