Jouandet M L
Neuroscience. 1982 Jul;7(7):1731-52. doi: 10.1016/0306-4522(82)90031-8.
The neocortical and basal telencephalic origins of the anterior commissure of the cat have not been described in earlier studies of the great cerebral commissures. In this anatomical study, all cerebral commissures, except the anterior commissure, of twelve cats were first transected. Subsequent unilateral injections of large quantities of horseradish peroxidase throughout the right hemisphere revealed the entire origins of the three branches of the anterior commissure in the left hemisphere. Since the anterior commissure was the only interhemispheric fibre system remaining, only the cells, fibres and anterogradely-labelled terminals of the anterior commissure were labelled by horseradish peroxidase in the uninjected hemisphere. Approximately three-quarters of the neurons of the anterior commissure are in the neocortex, mostly in layers V and VI. These neocortical cells occupy an extensive field stretching from gyrus proreus to the posterior ectosylvian gyrus and from the rhinal sulcus to the suprasylvian sulcus. Other fibres of the anterior commissure, however, were found to have their cell bodies in regions not considered part of the neocortex, and these included the anterior olfactory nucleus, the pyriform cortex, olfactory tubercles, nucleus of the lateral olfactory tract, part of the amygdaloid nuclei, the periamygdaloid nucleus and the lateral entorhinal area. Finally, it was found that the fibres of the anterior commissure do not have an exclusive neocortical territory from which cells of other commissural fibres are excluded. Rather, there appears to be a substantial overlap between the field of origin of fibres of the anterior commissure and those of the largest cerebral commissure, the corpus callosum. The disposition of this field may help to explain why visual information fails to transfer between the hemispheres in cats whose corpus callosum has been cut, in contrast to the success of such transfer in primates.
猫前连合的新皮质和端脑基部起源在早期关于大脑连合的研究中尚未被描述。在这项解剖学研究中，首先切断了12只猫除前连合之外的所有大脑连合。随后在整个右半球单侧大量注射辣根过氧化物酶，揭示了左半球前连合三个分支的完整起源。由于前连合是唯一剩余的半球间纤维系统，因此在未注射的半球中，只有前连合的细胞、纤维和顺行标记的终末被辣根过氧化物酶标记。前连合大约四分之三的神经元位于新皮质，主要在V层和VI层。这些新皮质细胞占据了一个广泛的区域，从额前回延伸到外侧枕颞回，从嗅沟延伸到上薛氏沟。然而，发现前连合的其他纤维的细胞体位于不被认为是新皮质一部分的区域，这些区域包括前嗅核、梨状皮质、嗅结节、外侧嗅束核、部分杏仁核、杏仁周核和外侧内嗅区。最后，发现前连合的纤维并没有一个排他性的新皮质区域，其他连合纤维的细胞被排除在该区域之外。相反，前连合纤维的起源区域与最大的大脑连合胼胝体的起源区域之间似乎存在大量重叠。这一区域的分布可能有助于解释为什么在胼胝体被切断的猫中，视觉信息无法在半球间传递，这与灵长类动物中这种传递的成功形成对比。
