title: Artery of Percheron
text: # Artery of Percheron
  
  The artery of Percheron (AOP) is a rare anatomical variation in the brain vascularization in which a single arterial trunk arises from the posterior cerebral artery (PCA) to supply both sides of the thalamus and midbrain.
  
  ## Clinical significance
  
  The functions of the thalamus and midbrain include the regulation of consciousness, sleep and alertness. Occlusion of the artery of Percheron, for example by a clot, could result in a posterior circulation infarct impairing structures on both sides of the brain. This can produce a bizarre disturbance such as sleep from which the patient cannot be awakened.
  
  ## History
  
  The artery of Percheron was first described in 1973 by the French medical scientist Gerard Percheron.
  
  