Matsunami K, Kawashima T, Ueki S, Fujita M, Konishi T
Department of Neurophysiology, Gifu University School of Medicine, Japan.
Neurosci Res. 1994 Aug;20(2):137-48. doi: 10.1016/0168-0102(94)90031-0.
The topography of the commissural fibers in the corpus callosum (CC) of the cat was systematically investigated using the WGA-HRP method. WGA-HRP was injected into various parts of the cerebral cortex and locations of WGA-HRP-stained commissural fibers in the CC were examined. Commissural fibers were arranged in a topological fashion in the CC. Cortical areas rostral to the cruciate sulcus (CrS), corresponding to motor or premotor cortices, projected fibers into the genu of the CC, while fibers from the cortex caudal to the CrS passed through the CC slightly caudal to the genu. When WGA-HRP was injected into the lateral gyrus (LG), it was observed that fibers from the anterior LG passed through the anterior one-third of the CC, whereas those from the posterior LG passed through or near the splenium, and fibers from the middle LG passed between those from the anterior and posterior LG. Similarly, the suprasylvian gyrus (SSG) projected commissural fibers in the CC in a rostrocaudal topological manner. Fibers from the anterior SSG passed through the anterior one-third of the CC, and those from the middle SSG through the middle one-third of the CC and upper part of the splenium. Injection into the most posterior part of the middle SSG revealed fibers passing through the caudal end of the splenium. Callosal fibers from the anterior SSG were focused on in this study, because this area (area 2v) is considered one of the vestibular projection cortices and is an area of special interest to the authors. Callosal fibers from the anterior SSG were observed to pass through the anterior one-third of the body of the CC. When WGA-HRP was injected into auditory areas, fibers from the anterior and middle ectosylvian gyri (ESG) were observed to pass through the posterior one-third of the body of the CC or through the splenium, while fibers from the posterior ESG passed through the splenium. WGA-HRP was also injected into the cingulate gyrus (CiG). Fibers from the anterior CiG (area 24) passed through the anterior portion of the CC while those from the posterior CiG (area 23) passed through the posterior portion of the CC.
采用WGA-HRP法对猫胼胝体（CC）连合纤维的局部解剖结构进行了系统研究。将WGA-HRP注入大脑皮质的不同部位，并检查CC中WGA-HRP染色的连合纤维的位置。连合纤维在CC中呈拓扑方式排列。位于十字沟（CrS）前方的皮质区域，对应于运动或运动前皮质，其纤维投射到CC的膝部，而来自CrS后方皮质的纤维则在略低于膝部的位置穿过CC。当将WGA-HRP注入外侧回（LG）时，观察到来自前LG的纤维穿过CC的前三分之一，而来自后LG的纤维则穿过压部或在其附近通过，来自中LG的纤维则在前LG和后LG的纤维之间通过。同样，上薛氏回（SSG）在CC中以头尾拓扑方式投射连合纤维。来自前SSG的纤维穿过CC的前三分之一，来自中SSG的纤维穿过CC的中间三分之一和压部的上部。注入中SSG最后部显示纤维穿过压部的尾端。本研究重点关注来自前SSG的胼胝体纤维，因为该区域（2v区）被认为是前庭投射皮质之一，也是作者特别感兴趣的区域。观察到来自前SSG的胼胝体纤维穿过CC体部的前三分之一。当将WGA-HRP注入听觉区域时，观察到来自前外侧薛氏回（ESG）和中外侧薛氏回的纤维穿过CC体部的后三分之一或通过压部，而来自后ESG的纤维则通过压部。还将WGA-HRP注入扣带回（CiG）。来自前CiG（24区）的纤维穿过CC的前部，而来自后CiG（23区）的纤维穿过CC的后部。
