Ventral midbrain syndrome (Webers syndrome)

What is the ventral midbrain syndrome? 

The ventral midbrain (Weber’s) syndrome is caused by occlusion of median and paramedian perforating branches and may result in:

  • Ipsilateral oculomotor paresis, ptosis, and dilated pupil (damage to fascicle of cranial nerve III, including parasympathetic fibers)
  • Contralateral hemiplegia, including the lower face (damage to corticospinal and corticobulbar tracts)
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