The anterior and posterior cerebral circulations are interconnected via bilateral posterior communicating arteries.
2.
The anterior communicating artery connects the two anterior cerebral arteries across the commencement of the longitudinal fissure.
3.
Aneurysms in the posterior circulation ( basilar artery, vertebral arteries and posterior communicating artery ) have a higher risk of rupture.
4.
About 20 % of adults retain PCA origin from the posterior communicating artery, and in turn, the internal carotid arteries.
5.
Finally, rupture of the anterior or posterior communicating artery, subarachnoid hemorrhage, and encephalitis are also possible causes of confabulation.
6.
Oculomotor nerve abnormalities ( affected eye looking downward and outward and palsy ( loss of movement ) may indicate bleeding from the posterior communicating artery.
7.
An etiology of vascular origin is an aneurysm of the anterior communicating artery which arise superior to the chiasm, enlarge, and compress it from above.
8.
The brain is supplied with blood by the internal carotid arteries and also by the posterior cerebral arteries; the posterior communicating arteries connects the two systems.
9.
The PCA begins as a continuation of the posterior communicating artery in 70-90 % of fetuses with the remainder of PCAs having a basilar origin.
10.
The posterior communicating artery is given off as a branch of the internal carotid artery just before it divides into its terminal branches-the anterior and middle cerebral arteries.
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