Efferent projections of the cingulate gyrus and an attempt of their multiple labelings.

用WGA-HRP法研究了猫和猴扣带回的皮质-皮质投射。一般来说，扣带回的皮质-皮质联系是相互的。在这个摘要中，相互联系只被称为皮质-皮质联系。在猫和猴中，皮质-皮质连接的特征如下：1）皮质-皮质的主要联系是与额、顶、颞联合皮质和边缘皮质的联系; 2）1）中的发现大多见于胼胝体上扣带回，但最前部不与顶联合皮质联系。在猫中选择了三个皮质-皮质投射，猴中也发现了它们的同源投射。（2）额前回周围及周边区（额联合皮质和边缘皮质），（3）鼻沟内及周围区（边缘皮质），在这三个区域注射WGA或类霍乱毒素，用ABC或ABC-AP免疫组化方法观察轴突运输。结果表明，扣带回神经元向联合体和边缘皮质的投射是点对点的投射，而不是广泛的侧支支配。

Cortico-cortical projections of the cingulate gyrus in the cat and monkey were examined by the WGA-HRP method. In general, the cortico-cortical connections of the cingulate gyrus are reciprocal. In this abstract the reciprocal connections are said only the cortico-cortical conncetions. In the cat and monkey characteristics of the cortico-cortical connections are as follows:1) The main cortico-cortical connections are with frontal, parietal and temporal association cortices, and paralimbic cortices, and 2) The findings in 1) are mostly common throughout the supra-callosal cingulate gyrus except the most anterior part which fail to connect with the parietal association cortex.In the cat following three cortico-cortical projections, homologous projections of which are demonstrated also in the monkey, are selected for the double-labeling method.1) The anterior and middle parts of the suprasylvian gyrus (Area 7), 2) Areas around and periphery of the proreus gyrus (frontal association cortex and paralimbic cortex), 3) Areas in and around the rhinal sulcus (paralimbic cortex).In these three areas WGA or choleragenoid was injected and the axonal transports were immuno-histochemically investigated with ABC or ABC-AP method. Double labelings of the retrograde transport of the WGA or choleragenoid could not be noticed in any of a pair of these series.Frim these results the cortico-cortical projections of the cingulate neurons to the association and paralimbic cortices appear to be point to point projections, not extensive collateral innervations.