猫冠状回向三叉脊束核的定位投射

TOPOGRAPHICAL PROJECTIONS OF THE CORONAL GYRUS TO THE SPINAL TRIGEMINAL NUCLEUS IN THE CAT

本实验用WGA—HRP法研究了猫冠状回向三叉脊束核的投射。结果是:(1)冠状回前部投至两侧三叉脊束核的背内侧部,对侧稍多于本侧。向尾侧亚核的投射,由吻侧向尾侧逐渐减少,在延髓下部平面只有对侧投射。(2)冠状回中、后部基本上投至对侧三叉脊束核。在尾侧亚核,中部主要投至吻侧半,向尾侧逐渐减少,于延髓下部平面消失;后部来的投射山吻侧向尾侧逐渐增多,核心部位移至尾侧半并延伸到最尾端。在极间亚核和吻侧亚核,其投射区随注射部位从前向后移而由内向外移。(3)于尾侧亚核,投射区主要为Ⅲ,Ⅳ层,但Ⅰ、Ⅱ层内也有少量标记终末支。

The topographical projections of the coronal gyrus(Co)onto the spinal trigeminal nucleus were investigated by using the method of the anterograde transport of WGA-HRP in the cat.The results obtained were as follows:1.The anterior part of the Co projected to bilateral dorsomedial parts of the spinal trigeminal nucleus with a slight contralateral dominance.At the lower level of the medulla oblongata,however,its projections were only contralateral.2.Projections of the middle and posterior parts of the Co to the spinal trigeminal nucleus were primarily contralateral.In the subnucleus cauda-lis,the projections to its rostral half were found mainly from the middie part of the Co,they decreased in amount gradually and disappeared at the caudal level of the medulla oblongata.The posterior part of the Co sent fibers principally to the caudal half of the subnucleus caudalis.In the subnuclei oralis and interpolaris,the middle and posterior parts of the Cosent fibers to its medial part and lateral part,respectively.3.In the subnucleus caudalis,the labelled terminal arborizations were found mainly in layersⅢandⅣ,but in layersⅠandⅡa few labelled granules could also be observed.