Ogawa T, Takahashi Y
Brain Res. 1981 Jul 27;217(1):1-11. doi: 10.1016/0006-8993(81)90180-3.
Intracellular staining of neurons located in the superficial layers of the superior colliculus (SC) of the cat was carried out through an intracellular recording micropipette with which responses to stimulation of the optic chiasm (OX) and the optic tract (OT) ipsilateral to the explored SC were recorded. :A total of 16 SC neurons were successfully stained. Retinotectal fibers which were synaptically connected to those morphologically identified neurons were classified as either W- or Y-fibers according to their conduction velocities. The conduction velocity of W-fibers ranged from 4.0 to 13.1 m/sec and that of Y-fibers from 35.5 to 42.0 m/sec. Neurons located in the upper part of the stratum griseum superficiale (SGS) were found to be monosynaptically or polysynaptically supplied by W-fibers, while some neurons located in the lower part of SGS were monosynaptically connected to Y-fibers and others monosynaptically or polysynaptically to W-fibers. Morphologically SC neurons were classified as horizontal (1), narrow-field vertical (3), wide-field vertical type II (6) and type III cells (3) with 3 unidentified neurons. W-fibers were connected to the horizontal, narrow-field vertical and wide-field vertical type-II cells while Y-fibers contacted only wide-field vertical type-III cells.
通过细胞内记录微电极对猫上丘（SC）表层的神经元进行细胞内染色，并用该微电极记录对同侧视交叉（OX）和视束（OT）刺激的反应。总共成功染色了16个SC神经元。根据其传导速度，将与那些形态学上已鉴定的神经元形成突触连接的视网膜顶盖纤维分为W纤维或Y纤维。W纤维的传导速度范围为4.0至13.1米/秒，Y纤维的传导速度范围为35.5至42.0米/秒。发现位于浅层灰质（SGS）上部的神经元由W纤维单突触或多突触供应，而位于SGS下部的一些神经元与Y纤维单突触连接，其他神经元与W纤维单突触或多突触连接。形态学上，SC神经元分为水平型（1个）、窄视野垂直型（3个）、宽视野垂直II型（6个）和III型细胞（3个），有3个神经元未鉴定。W纤维与水平型、窄视野垂直型和宽视野垂直II型细胞相连，而Y纤维仅与宽视野垂直III型细胞接触。
