Department of Human Anatomy, University of Nairobi, Nairobi, Kenya.
Clin Anat. 2011 Sep;24(6):692-8. doi: 10.1002/ca.21147. Epub 2011 Mar 3.
Branching pattern of middle cerebral artery influences frequency of its aneurysms, and is of potential value in their surgical repair and diagnosis of stroke. This pattern shows inter-population variations but there is paucity of data from Africans. This study aimed at describing branching pattern among black Kenyans. Middle cerebral arteries numbering 288 from 144 formalin fixed brains obtained during dissection and autopsy at Department of Human Anatomy, University of Nairobi, Kenya were studied. Origin of the middle cerebral artery was identified at base of brain and its stem followed by gently separating the fronto-parietal and temporal lobes. Pattern of early cortical, lenticulostriate, and terminal branching was recorded and macrographs taken. Results were analyzed using SPSS version 13.0 for windows and presented using macrographs. All the brains had bilateral middle cerebral arteries which were continuations of the internal carotid artery. Variations of the artery observed included duplication (1.7%), early bifurcation (5.2%), and early cortical branching (47%), predominantly temporal (63.9%). Lenticulostriate arteries arose predominantly from the pre-bifurcation segment as single branches (64.6%), and as common trunks (35.4%). Modes of termination were bifurcation (82.3%), trifurcation (10.8%), primary trunks (6.2%), and quadrifurcation (0.7%). Cortical branching pattern of the middle cerebral artery resembles that of Caucasian and Indian populations suggesting equal vulnerability to aneurysms and stroke. Pattern of origin of lenticulostriate arteries, predominantly from the pre-bifurcation segment and higher percentage of common trunks implies that the population is more prone to ischemia after aneurysm repair. Extra diligence during operation on proximal middle cerebral artery is called for.
大脑中动脉的分支模式影响其动脉瘤的频率，对其手术修复和中风的诊断具有潜在价值。这种模式显示出人群间的差异，但来自非洲人的数据很少。本研究旨在描述肯尼亚黑人的大脑中动脉分支模式。研究了从肯尼亚内罗毕大学人体解剖学系在解剖和尸检过程中获得的 288 根福尔马林固定大脑中的大脑中动脉。在大脑基部识别大脑中动脉的起源，并沿其主干轻轻分离额顶叶和颞叶。记录早期皮质、纹状体和终末分支的模式，并拍摄大照片。使用 SPSS 版本 13.0 for windows 分析结果，并使用大照片呈现。所有大脑都有双侧大脑中动脉，它们是颈内动脉的延续。观察到的动脉变化包括复制（1.7%）、早期分叉（5.2%）和早期皮质分支（47%），主要是颞叶（63.9%）。纹状体动脉主要起源于前分叉段，作为单支（64.6%）和共同干（35.4%）。终止方式包括分叉（82.3%）、三分叉（10.8%）、主干（6.2%）和四分叉（0.7%）。大脑中动脉的皮质分支模式与白人和印度人群相似，表明对动脉瘤和中风的易感性相等。纹状体动脉起源模式主要来自前分叉段和更高比例的共同干，这意味着人群在动脉瘤修复后更容易发生缺血。在近端大脑中动脉手术过程中需要更加谨慎。
