Posterior communicating artery

Posterior Communicating Artery

Circle of Willis, showing the posterior communicating arteries (labeled as 'posterior com. a.')

The Posterior Communicating Artery (PcomA) is a small vessel of the Circle of Willis that connects the posterior cerebral artery and the internal carotid artery. It plays a crucial role in maintaining the cerebral blood flow.

Structure

The posterior communicating artery is a part of the Circle of Willis, which is a circular anastomosis at the base of the brain. It is typically smaller than the anterior communicating artery. The artery travels laterally from the internal carotid artery to the posterior cerebral artery, forming a connection between the two.

Function

The primary function of the posterior communicating artery is to provide a collateral circulation to the brain. This means that if one of the main vessels supplying blood to the brain is blocked, the posterior communicating artery can provide an alternative route for blood to reach the brain tissue.

Clinical significance

The posterior communicating artery is a common site for the formation of aneurysms. A Posterior communicating artery aneurysm can lead to a subarachnoid hemorrhage, a serious condition that requires immediate medical attention.

See also

• Circle of Willis
• Cerebral aneurysm
• Subarachnoid hemorrhage