猫外侧膝状体腹核至上丘和顶盖前区的定位投射——HRP法

THE TOPOGRAPHICAL PROJECTION FROM THE VENTRAL LATERAL GENICULATE NUCLEUS TO THE SUPERIOR COLLICULUS AND PRETECTUM IN THE CAT

本文采用HRP方法观察了猫外侧膝状体腹核至上丘和顶盖前区的定位投射,HRP注射在上丘深层后,可见同侧较吻端的外侧膝状体腹核内侧部腹侧半的许多细胞被标记,这些细胞成团分布,多为圆形或卵圆形。注射在吻端顶盖前区以后,二侧较尾端的外侧膝状体腹核外侧部的细胞被标记,以对侧为主。注射至尾端顶盖前区(部分扩散至上丘)后,同侧较尾端的外侧膝状体腹核外侧部腹侧半的细胞被标记。与注射于上丘者相比,细胞密度较低,亦为圆形或卵圆形,提示外侧膝状体腹核至上丘或顶盖前区的投射具有较明显的局部组构关系。

The present investigation was performed on six adult cats.The morphology and distribution of the labeled cells in the ventral lateral geniculate nucleus(LGNv)were observed.Following the injection of horseradish peroxidase(HRP)into the deeper layers of the superior colliculus the labeled cells were found to concentrate ipsilaterally in the ventral part of the rostromedial division of the LGNv.The HRP-positive cells were composed of large-sized,smaller,round and oval ceils.In the cases of injection of HRP into the rostral pretectum,the HRP-positive cells were seen bilaterally in the caudolateral division of LGNv mainly in the contralateral part,while the labeled cells were found ipsilaterally in the ventral part of caudolateral division after injection of HRP into the caudal pretectum.These cells were smaller than that large ones of superior colliculus injection.The results indicate that the projection of the LGNv to the superior colliculus and pretectum is organized topographically.