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

用WGA-HRP法观察了猫和猕猴扣带回的皮质投射。一般来说，扣带回的皮质-皮质联系是相互的。在本摘要中，相互连接仅指皮质-皮质连接。在猫和猴中，皮质-皮质联系的特点如下：1)皮质-皮质联系主要与额叶、顶叶和颞叶联合皮质，以及边缘旁皮质；2)1)发现最常见的是整个扣带回，除了最前面的部分没有与顶叶联系皮质连接。在猫的三个皮质-皮质投射中，其相应的投射也在猴子身上被选择用于双标记法。1)丘上回的前部和中部(7区)，2)前脑回周围及周边区域(额叶联合皮质和边缘旁皮质)，3)鼻沟内及周围区域(边缘旁皮质)。在这3个区域内注射WGA或霍乱素，用ABC或ABC-AP法对轴突运输进行免疫组织化学研究。结果表明，扣带回神经元向结缔组织和边缘旁皮质的皮质投射似乎是点对点投射，而不是广泛的侧支神经支配。

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.