Anterior communicating artery

The anterior communicating artery connects the two anterior cerebral arteries across the commencement of the longitudinal fissure. Sometimes this vessel is wanting, the two arteries joining to form a single trunk, which afterward divides; or it may be wholly, or partially, divided into two. Its length averages about 4 mm, but varies greatly. It gives off some of the anteromedial ganglionic vessels, but these are principally derived from the anterior cerebral artery.

It is part of the cerebral arterial circle, also known as the circle of Willis.{{Cite book|url=https://www.worldcat.org/oclc/144771764|title=Neuroscience|date=2008|publisher=Sinauer|others=Purves, Dale., Augustine, George J., (George James) 1955-, Fitzpatrick, David, 1952-, Hall, William C. (William Charles), 1940-, LaMantia, Anthony-Samuel,, McNamara, James O. (James O'Connell), 1969-|isbn=978-0-87893-697-7|edition=4th|location=Sunderland, Mass.|oclc=144771764}}

Anatomical variations of the anterior communicating artery are relatively common. The artery is sometimes duplicated, multiplicated, fenestrated ("net-like") or very short, giving the impression that two anterior cerebral arteries are fused at the point where the anterior communicating artery is usually expected to arise.{{Cite journal|last1=Kardile|first1=Poorwa Baburao|last2=Ughade|first2=Jaideo Manohar|last3=Pandit|first3=Sudhir Vishnupant|last4=Ughade|first4=Manohar Namdeo|date=December 2013|title=Anatomical variations of anterior communicating artery|journal=Journal of Clinical and Diagnostic Research|volume=7|issue=12|pages=2661–2664|doi=10.7860/JCDR/2013/6664.3725|issn=2249-782X|pmc=3919289|pmid=24551604}}

Normally, the anterior communicating artery does not significantly contribute to cerebral blood supply, as there is negligible net blood flow within it, and some of its anteromedial branches seem to be specially adapted to ease forebrain sodium sensing, rather than to supply the brain with blood.{{Cite journal|last1=Fenrich|first1=Matija|last2=Habjanovic|first2=Karlo|last3=Kajan|first3=Josip|last4=Heffer|first4=Marija|date=2020-11-16|title=The circle of Willis revisited: Forebrain dehydration sensing facilitated by the anterior communicating artery: How hemodynamic properties facilitate more efficient dehydration sensing in amniotes|journal=BioEssays|volume=43|issue=2|language=en|pages=2000115|doi=10.1002/bies.202000115|pmid=33191609|issn=0265-9247|doi-access=free}}

Aneurysms of the anterior communicating artery are the most common circle of Willis aneurysmBeck J, Rohde S, Berkefeld J, Seifert V, Raabe A. Size and location of ruptured and unruptured intracranial aneurysms measured by 3-dimensional rotational angiography. Surg Neurol. 2006 Jan;65(1):18-25; discussion 25-7. {{PMID|16378842}}. and can cause visual field defects such as bitemporal heteronymous hemianopsia (due to compression of the optic chiasm),Aoki N. Partially thrombosed aneurysm presenting as the sudden onset of bitemporal hemianopsia. Neurosurgery. 1988 Mar;22(3):564-6. {{PMID|3362325}}. psychopathology and frontal lobe pathology.Johnson MK, O'Connor M, Cantor J. Confabulation, memory deficits, and frontal dysfunction. Brain Cogn. 1997 Jul;34(2):189-206. {{PMID|9220085}}.

In case of narrowing of other arteries of the circle of Willis or the arteries supplying the circle, the anterior communicating artery can provide a way to supply blood to the opposite (affected) side of the circle. This can often preserve the cerebral blood supply well enough to avoid the symptoms of ischemia.{{Cite journal|last1=de Boorder|first1=Michiel J.|last2=van der Grond|first2=Jeroen|last3=van Dongen|first3=Alice J.|last4=Klijn|first4=Catharina J. M.|last5=Jaap Kappelle|first5=L.|last6=Van Rijk|first6=Peter P.|last7=Hendrikse|first7=Jeroen|date=October 2006|title=Spect measurements of regional cerebral perfusion and carbondioxide reactivity: correlation with cerebral collaterals in internal carotid artery occlusive disease|url=https://pubmed.ncbi.nlm.nih.gov/17063318|journal=Journal of Neurology|volume=253|issue=10|pages=1285–1291|doi=10.1007/s00415-006-0192-1|issn=0340-5354|pmid=17063318|s2cid=22591168}}

File:Arteries beneath brain.png pole of the cerebrum and a portion of the cerebellar hemisphere have been removed on the right side. Inferior aspect (viewed from below).]]

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• {{cite web|url=http://www.tk.de/rochelexikon/pics/s13048.000-1.html |title=Anatomy diagram: 13048.000-1 |work=Roche Lexicon - illustrated navigator |publisher=Elsevier |archive-url=https://web.archive.org/web/20141107120933/http://www.tk.de/rochelexikon/pics/s13048.000-1.html |archive-date=2014-11-07 |url-status=dead }}
• {{cite web|url=http://www.tk.de/rochelexikon/pics/s13048.000-3.html |title=Anatomy diagram: 13048.000-3 |work=Roche Lexicon - illustrated navigator |publisher=Elsevier |archive-url=https://web.archive.org/web/20120722052451/http://www.tk.de/rochelexikon/pics/s13048.000-3.html |archive-date=2012-07-22 |url-status=dead }}

{{Arteries of head and neck}}

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Category:Arteries of the head and neck

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