猫大脑皮质向三叉神经脊束核吻侧亚核的投射——HRP逆行轴突运输追踪法研究

THE PROJECTION OF THE CEREBRAL CORTEX TO THE ORAL SUBNUCLEUS OF SPINAL TRIGEMINAL NUCLEUS IN THE CAT——A STUDY WITH THE HRP RETROGRADE TRACING METHOD

本实验用HRP逆行轴突运输追踪法探讨了猫大脑皮质向三叉神经脊束核吻侧亚核(Vo)投射的起源细胞的分布。结果表明:冠状回是最主要的起源部位,其前、后部向Vo的投射有局部定位关系。该回前部的标记细胞数量较后部明显多,内、外半的起源细胞数量也不同。眶回的前部,乙状前回外侧部的前部也有大量标记细胞。该三回的最前端相互连接成为“前斯氏回”,此处是皮质—Vo投射的最核心起源部位。另外,标记细胞还见于上斯氏前回、乙状后回、侧回和外斯氏前回。所有的标记细胞都位于大脑皮质第Ⅴ层,大小不等。未发现先导回及颞、枕叶皮质有向Vo的投射。

The cortical distribution of thecells of origin of the corticotrigeminal projection to the oral subnucleus of spinal trigeminal nucleus(Vo)was examined with the HRP retrograde tracing method.The results showed that the coronal gyrus was the main site of origin.The anterior part and the posterior part of the gyrus projected to the dorsomedial portion and the ventrolateral portion of Vo respectively.The amount of labelled cells in the anterior part of the gyrus was much larger than those in the posterior.There were also numerous labelled cells in the anterior parts of orbital gyrus and of the lateral zone of anterior sigmoid gyrus.The most anterior ends of these three gyri joined together forming the so-called"presylvian gyrus"where the labelled cells were most concentrated.In addition,the labelled cells were also scattered in the anterior suprasylvian gyrus,posterior sigmoid gyrus,lateral gyrus and anterior ectosylvian gyrus.All labelled cells were located in the fifth layer of the cortex.Their size varied.The results of the present study did not support that there were projections from the temporal and occipital lobes and proreate gyrus to Vo.