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definition - nigrostriatal pathway

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Nigrostriatal pathway

                   
  Dopaminergic and serotonergic pathways. Nigrostriatal pathway can be seen projecting upward from the substantia nigra to the striatum.

Dopaminergic pathways are neural pathways in the brain which transmit the neurotransmitter dopamine from one region of the brain to another.[1]

The nigrostriatal pathway is a neural pathway that connects the substantia nigra with the striatum. It is one of the four major dopamine pathways in the brain, and is particularly involved in the production of movement, as part of a system called the basal ganglia motor loop.

Loss of dopamine neurons in the substantia nigra is one of the main pathological features of Parkinson's disease,[2] leading to a marked reduction in dopamine function in this pathway. The symptoms of the disease typically do not show themselves until 80-90% of dopamine function has been lost.

This pathway is also implicated in producing tardive dyskinesia, one of the side-effects of antipsychotic drugs. These medications (particularly the older typical antipsychotics) block D2 dopamine receptors in multiple pathways in the brain.

The desired clinical effect of reducing psychotic symptoms is thought to be associated with blocking dopamine function in the mesolimbic pathway only. However, as many of these drugs are not selective, they block dopamine in all pathways. When this happens in the nigrostriatal pathway, similar movement problems to those found in Parkinson's disease can occur.

Contents

  Other dopamine pathways

Other major dopamine pathways include:

  See also

  References

  1. ^ "Beyond the Reward Pathway". http://learn.genetics.utah.edu/content/addiction/reward/pathways.html. Retrieved 2009-10-23. 
  2. ^ Diaz, Jaime. How Drugs Influence Behavior. Englewood Cliffs: Prentice Hall, 1996.

  External links

   
               

 

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