Vascular Anatomy: Internal Carotid Artery: Posterior Communicating Artery
Internal Carotid System
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Cervical Carotid
 

 
Posterior Communicating Artery

Second branch of supraclinoid internal carotid.

Connects
anterior circulation (carotid system)
with posterior circulation (vertebrobasilar system)

Supplies thalamus, hypothalamus, optic chiasm, and mamillary bodies.
Common site for aneurysms.