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首页> 外文期刊>Journal of Neurophysiology >Corticoreticular pathways in the cat. I. Projection patterns and collaterization.
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Corticoreticular pathways in the cat. I. Projection patterns and collaterization.

机译：在猫的皮质网状通路。一，投影方式和协作化。

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This paper summarizes and compares the projection patterns and the receptive fields of cortical neurons in areas 4 and 6 that project to the pontomedullary reticular formation (PMRF). A total of 326 neurons were recorded in area 4 and 129 in area 6 in four awake, unrestrained cats that were chronically implanted with arrays of electrodes in the PMRF and the pyramidal tract (PT). In area 4, 47% of the neurons projected to the caudal PT but not to the PMRF (PTNs); 19% were activated only from the PMRF [corticoreticular neurons (CRNs)], whereas 27% were activated from both the PT and the PMRF (PTN/CRNs). More PTN/CRNs conducted at velocities >20 m/s (82%) than did CRNs (23%). In area 6, only 19% of the neurons were identified as PTNs, 12% were PTN/CRNs and 31% were CRNs; a further 38% could not be activated from either structure. Collateral branches within the PMRF conducted at maximum velocities of 20 m/s (average = 6.5 m/s). No significant differences in the conduction velocities of the collateral branches were found either between fast and slow PTNs or between area 4 and area 6 neurons. A large proportion of neurons in area 4 (85/173, 49%) were activated by passive manipulation of the more distal, contralateral forelimb, with approximately equal numbers being classed as PTNs, PTN/CRNs and CRNs. Most neurons in area 6 for which a receptive field could be found were excited by lightly touching or tapping the face and neck; a receptive field could not be determined for 39% of the area 6 neurons compared with only 5% of those in area 4. Finally, there was evidence that neurons in quite widespread areas of the pericruciate cortex, including both areas 4 and 6 projected onto similar, restricted regions of the PMRF. The fact that the cortical projection from area 4 to the PMRF includes a high percentage of fast PTNs with a receptive field on the distal forelimb is consistent with the view that this projection may serve to integrate movement and the dynamic postural adjustments that accompany them. The fact that the cortical projection from area 6 to the PMRF is primarily from slow PTNs with receptive fields on the face, neck and back is consistent with a role for this cortical area in adjusting the general posture of the animal on which movements are superimposed.
机译：本文总结并比较了投射到椎弓状网状结构（PMRF）的区域4和6中的皮质神经元的投射模式和感受野。在四只清醒无拘束的猫中，在第4区和第6区中总共记录了326个神经元，这些猫长期在PMRF和锥体束（PT）中植入电极阵列。在区域4中，有47％的神经元投射到尾PT，但不投射到PMRF（PTN）。仅从PMRF [皮层神经网络（CRNs）]激活了19％，而从PT和PMRF（PTN / CRNs）激活了27％。以大于20 m / s的速度（82％）进行的PTN / CRN要比CRN（23％）多。在区域6中，只有19％的神经元被识别为PTN，12％是PTN / CRN，而31％是CRN。两种结构均无法激活另外38％的结构。 PMRF内的分支分支以最大20 m / s的速度（平均= 6.5 m / s）进行。在快速和慢速PTN之间或在区域4和区域6神经元之间，未发现侧支的传导速度有显着差异。被动操作更远端的对侧前肢激活了区域4中的大部分神经元（85/173，49％），其中大约相等数量的神经元被分类为PTN，PTN / CRN和CRN。轻触或轻拍脸部和颈部会激发区域6中能找到感受野的大多数神经元。不能确定区域6中39％的神经元的感受野，而区域4中只有5％。最后，有证据表明，在周缘皮层相当广泛的区域中的神经元，包括区域4和6投射到PMRF的类似限制区域。从区域4到PMRF的皮质投影包含高百分比的快速PTN，在远端前肢上具有接受区域，这一事实与以下观点一致：该投影可用于整合运动和伴随它们的动态姿势调整。从区域6到PMRF的皮质投影主要来自慢速PTN，其面部，颈部和背部均具有感受野，这与该皮质区域在调节动物所叠加的总体姿势中的作用一致。

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