Ataxic Hemiparesis


Cerebral hemisphere: Posterior limb of external capsule, Pons: Basis pontis


  • Middle cerebral artery: Small penetrating arteries
  • Basilar artery: Small penetrating arteries

Signs & Symptoms

Side Manifestation Comments
Contralateral Weakness – upper and lower extremity  
Contralateral Ataxia – arm and leg  


Weakness usually more prominent in leg than arm; extensor plantar response; no facial involvement or dysarthria. Other locations include thalamocapsular lesions, red nucleus, anterior cerebral artery distribution. Also called “homolateral ataxia and crural paresis.”