ANATOMIC RELATIONSHIPS ALONG THE LOW-MIDDLE CONVEXITY .1. NORMAL SPECIMENS AND MAGNETIC-RESONANCE-IMAGING
ANATOMIC RELATIONSHIPS ALONG THE LOW-MIDDLE CONVEXITY .1. NORMAL SPECIMENS AND MAGNETIC-RESONANCE-IMAGING
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DOI：
10.1227/00006123-199503000-00011
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发表时间：
1995-03-01
期刊：
影响因子：
4.8
通讯作者：
KUBIK, S
中科院分区：
文献类型：
--
作者：
NAIDICH, TP;VALAVANIS, AG;KUBIK, S
解剖标本的矢状面和磁共振图像很好地显示了沿着中低凸度的单个脑回和脑沟。那些熟悉典型模式和常见正常变异的人将能够使用矢状面磁共振成像通过识别：(A)侧裂的五大支；(B)由侧裂的前水平支和前升支将额下回三角形细分为眼眶、三角和盖部；(C)额中回的Z字形形状，其特征是与中央前回的前表面形成尖锐和较低的角度；(D)下额沟后端的T形分叉以形成中央前下沟；(E)中央沟与侧裂的中央沟分离，中央前回和中央后回的顶端相连，形成中央沟下方的中央下回；(F)中央后回的矢状径比中央前回窄；(G)位于侧裂后升支上的边缘上回呈马蹄形；(H)位于上颞沟后端的角状回类似马蹄形；(I)通常夹杂着中央前缘回和角前回；以及(J)顶内沟的弧形走行，它将顶上小叶与顶下小叶分开。所描述的解剖关系在前方比后方更接近恒定。当按照描述使用时，它们被证明有助于正确地定位病理，并有助于规划手术入路，以治疗根据轴位或冠状面磁共振图像可能难以定位的病变。
SAGITTAL SECTIONS OF anatomic specimens and magnetic resonance images well display the individual gyri and sulci along the low-middle convexity. Those familiar with the typical pattern and with the common normal variations will be able to use sagittal magnetic resonance imaging to correctly localize lesions by identifying: (a) the five major rami of the sylvian fissure; (b) the subdivision of the triangular inferior frontal gyrus into the M-shaped partes orbitalis, triangularis, and opercularis by the anterior horizontal and anterior ascending rami of the sylvian fissure; (c) the zig-zag shape of the middle frontal gyrus, which characteristically angles sharply and inferiorly to fuse with the anterior surface of the precentral gyrus; (d) T-shaped bifurcation of the posterior end of the inferior frontal sulcus to form the inferior precentral sulcus; (e) separation of the central sulcus from the sylvian fissure by union of the opercular ends of the precentral and postcentral gyri to form the subcentral gyrus inferior to the central sulcus; (f) narrower sagittal dimension of the postcentral gyrus than the precentral gyrus; (g) horseshoe shape of the supramarginal gyrus perched atop the posterior ascending ramus of the sylvian fissure; (h) similar horseshoe shape of the angular gyrus perched atop the posterior end of the superior temporal sulcus; (i) commonly intercalated accessory presupramarginal and preangular gyri; and (j) the arcuate course of the intraparietal sulcus, which separates the superior from the inferior parietal lobules. The anatomic relationships described are more nearly constant anteriorly than posteriorly. When used as described, they prove helpful in correctly localizing pathology and in planning a surgical approach to lesions that may be difficult to localize on the basis of axial or coronal plane magnetic resonance images.