The cortical projection to the nucleus reticularis tegmenti pontis in the rhesus monkey
The cortical projection to the nucleus reticularis tegmenti pontis in the rhesus monkey
复制标题
恒河猴的皮质投射到脑桥网状核
作者：
P. Brodal
摘要用银浸渍法研究了恒河猴大脑皮层向桥织网状核（NRT）的投影。NRT的大部分皮层传入事件发生在中央前运动皮层（4区），而更多的贡献来自运动前区（6区）、体感皮层（3、1、2区）和5区。在皮层其他部分病变后，在NRT中观察到的变性纤维很少，如果有的话。除背内侧部分外，皮层传入信号终止于整个NRT。这是一种地形安排，因此来自6区的纤维在NRT最中间终止，来自5区的纤维最外侧（在外侧被盖突），而来自运动皮层的纤维在两者之间结束并覆盖最大的终端区。此外，运动皮层的投影在体位上有组织，在NRT中腿部代表腹侧，手臂代表背侧。然而，在不同皮层区域的纤维末端区域之间有大量的重叠。讨论了与NRT的其他传入事件的终止有关的结果，得出的结论是，即使存在高度收敛，NRT的各个部分似乎也不会接收相同的传入输入集。
SummaryThe projection from the cerebral cortex to the nucleus reticularis tegmenti pontis (NRT) has been studied in the rhesus monkey with silver impregnation methods. The majority of cortical afferents to NRT arise in the precentral motor cortex (area 4), while more modest contributions come from the premotor region (area 6), the somatosensory cortex (areas 3, 1, and 2) and area 5. Very few, if any, degenerating fibres were observed in the NRT after lesions of other parts of the cortex. The cortical afferents terminate throughout NRT except in its dorsomedial part. There is a topographical arrangement so that fibres from area 6 terminate most medially in the NRT, fibres from area 5 most laterally (in the processus tegmentosus lateralis), while fibres from the motor cortex end in between and cover the largest terminal field. In addition, the projection from the motor cortex is somatotopically organized with the leg represented ventrally and the arm dorsally in the NRT. There is, however, ample overlap between the terminal regions of fibres from the various cortical areas. The results are discussed in relation to the termination of other afferent contingents to the NRT, and it is concluded that even if there is a high degree of convergence, various parts of the NRT appear not to receive identical sets of afferent inputs.