Gábriel R, Straznicky C
Department of Zoology, Attila József University, Szeged, Hungary.
Neurobiology (Bp). 1993;1(4):313-25.
Previous studies have shown that a small proportion of the retinal fibres to the optic tectum terminates in the deep tectal cellular layers (layers 6 and 4) in Anura. Horseradish peroxidase was applied to the cut central end of the optic nerve of Bufo marinus to study the synaptic connections of these retinotectal afferents. Some of the retinotectal afferents arrive at the deep tectal layers and form synapses with dendrites (7% of all tectal inputs) and on the somata of the deep tectal cells (0.4% of all tectal inputs). These synapses may either serve as elements of the dimming detection system or could be the morphological substrates of a direct link between the visual and the descending motor system.
先前的研究表明，在无尾两栖类动物中，一小部分投射到视顶盖的视网膜纤维终止于顶盖深层细胞层（第6层和第4层）。将辣根过氧化物酶应用于海蟾蜍视神经的切断中央端，以研究这些视网膜-顶盖传入纤维的突触连接。一些视网膜-顶盖传入纤维到达顶盖深层，并与树突形成突触（占所有顶盖传入纤维的7%）以及与顶盖深层细胞的胞体形成突触（占所有顶盖传入纤维的0.4%）。这些突触可能要么作为暗度检测系统的组成部分，要么可能是视觉系统与下行运动系统之间直接联系的形态学基础。
