Posterior communicating artery

Last revised by Andrew Murphy on 02 Sep 2021

The posterior communicating artery (PCom) makes up the posterior linkage in the circle of Willis.

The posterior communicating artery originates from the posterior aspect of the C7 (communicating) segment of the internal carotid artery and extends posteriormedially to anastomose with the ipsilateral posterior cerebral artery and form part of the circle of Willis

The posterior communicating artery gives off many fine, scarcely visible, perforating branches. The largest perforating branch is called the premamillary (or anterior thalamoperforating) artery. 

Perforators from the posterior communicating artery supply:

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Cases and figures

  • Figure 1: circle of Willis diagram showing PCom
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  • Figure 2: normal CoW anatomy
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  • Case 1: bilateral fetal PCom arteries
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  • Case 2: PCom infundibulum
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