Anterior Choroidal arteries

Arise from the ICA
Course: goes through the choroidal fissure → temporal horn of LV Vascular territory:
- Choroid of the LVs (especially in the lateral horn) Hippocampus, amygdala, uncus
- Globus pallidus, caudate tail, putamen Thalamus (VL)
- IC (posterior limb and retrolenticular)
- Optic tract, lateral geniculate nucleus, optic radiation
Historically, this artery was sacrificed to treat Parkinson’s disease: decreased tremor likely due to decreased blood supply to VL thalamus.

Posterior Choroidal arteries (medial and lateral)

Arise from the PCA
Medial branches supply pineal gland, tectum, thalamus, choroid of the third ventricle
Lateral branches enter the choroidal fissure and anastomose with the anterior choroidal arteries forming variable anastomotic network