Behan M, Appell P P
Department of Comparative Biosciences, University of Wisconsin, Madison 53706.
J Comp Neurol. 1992 Jan 8;315(2):230-43. doi: 10.1002/cne.903150209.
The neuroanatomical tracer Phaseolus vulgaris leucoagglutinin (PHA-L) was used to label the local projections of neurons whose cell bodies are located in the superficial layers of the cat superior colliculus. Small, localized groups of neurons in the superficial layers project to all regions of the ipsilateral colliculus, including the deep layers. Comparable distributions of labeled terminals are seen throughout the colliculus when the PHA-L injection site is located in the rostral, middle, or caudal one-third of the colliculus. In addition, there is some evidence of a topographic projection from superficial to deep layers. These results suggest that a complex anatomical substrate exists for communication between the superficial and deep layers of the colliculus. Connections such as these may underlie the transfer of visual information from neurons in the superficial layers to populations of neurons in the deep layers that respond prior to saccadic eye movements.
神经解剖示踪剂菜豆白细胞凝集素（PHA-L）被用于标记其细胞体位于猫上丘表层的神经元的局部投射。表层中局部的小群神经元投射到同侧上丘的所有区域，包括深层。当PHA-L注射部位位于上丘的前三分之一、中间三分之一或后三分之一时，在整个上丘都能看到标记终末的类似分布。此外，有一些证据表明存在从表层到深层的拓扑投射。这些结果表明，上丘表层和深层之间存在复杂的解剖学底物用于信息交流。这样的连接可能是视觉信息从表层神经元传递到深层神经元群体的基础，这些深层神经元在眼球快速运动之前做出反应。
