Anterior communicating aneurysm in correlation with applied surgical anatomy

AbstractIntracranial aneurysms represents a major public health problem ,and it is estimated that 2.3% of people have undetected aneurysms.The commonest sites for occurrence of intracranial aneurysms is in order of frequency, the anterior communicating artery, the posterior communicating artery origin from internal carotid artery, the middle cerebral artery and lastly, the basilar artery bifurcation.The two anterior cerebral arteries, Anterior communicating artery, Artery of Heubner and perforating vessels arising from these vessels are called the anterior cerebral_Anterior communicating complex.The anatomy of this complex is characterized by numerous anomalies &variations, so it gains a great surgical importance.AcoA gives rise to small perforating arteries from its posteroinferior aspect. These perforators range from two to eight in number, averaging 4.1, and their diameter varies from 0.1 to 0.8 mm, averaging 0.25 mm.The vascular territories of these perforators are classified into three regions. The first is the subcallosal region; it supplying artery is called the subcallosal branch. The second is the hypothalamic region; it supplying artery is called the hypothalamic branch. The third is the chiasmatic region; it supplying artery is called the chiamastic branch.