Basilar Artery

• Anterior inferior cerebellar artery• Superior cerebellar artery• Posterior cerebral artery

– Posterior choroidal arteries

• Blood supply to the thalamus, midbrain, pons, medulla, cerebellum

Vertebral Artery• Dural entry• Anterior spinal artery• Ant/post meningeal arteries• Posterior inferior cerebellar artery

– Anterior medullary segment– Lateral medullary segment– Tonsillomedullary– Telovelotonsillar– Cortical

Venous Anatomy

• Superficial vs deep veins

• Sinuses

• Symptoms with venous congestion

Clinical Cases

Subarachnoid Hemorrhage

• 71 year old man• Headache, no deficit• Interpeduncular blood

Cause of Subarachnoid Hemorrhage?

Pre-nidal Aneurysm

Selective Posterior Cerebral Arteries

Post- treatment

Risk of Bleed Eliminated?

• Incomplete L IIIrd n palsy

• No other deficits• Treatment of AVM