Edwards S B
J Comp Neurol. 1977 May 1;173(1):23-40. doi: 10.1002/cne.901730103.
The origin, course, and termination of the commissural projection of the superior colliculus were studied using the orthograde and autoradiographic tracing method and the retrograde method utilizing horseradish peroxidase. The complementary and mutually confirming sets of data showed that the commissural fibers interconnect a restricted region of the colliculi. This region includes the strata grisea intermedium and profundum and to a lesser degree the stratum opticum. It extends throughout only the rostral part of the colliculus where it ends abruptly at a level slightly less than half the distance from the anterior border of the deep gray layers. By using the needle used for isotope injection to record multiunit responses to somatic and visual stimuli, direct evidence was obtained that this region falls within that functional area of the colliculus devoted to face representation and central vision. The results also suggested that more commissural fibers arise from lateral than medial parts of this region and that many fibers interconnect corresponding points in the colliculi. In addition to intertectal connections, the commissural projection contains decussating axons which terminate in tegmental structures and within a restricted zone of the central gray matter directly overlying the oculomotor complex. The results are discussed in relation to the possible role the commissural projection plays in the regulation of eye and head movement.
采用顺行和放射自显影追踪法以及利用辣根过氧化物酶的逆行法，对上丘连合投射的起源、行程和终止进行了研究。互补且相互印证的数据集表明，连合纤维连接上丘的一个受限区域。该区域包括中间灰质层和深层灰质层，在较小程度上还包括视层。它仅延伸至上丘的前部，在距深灰层前缘略小于一半距离的水平处突然终止。通过使用用于同位素注射的针来记录对躯体和视觉刺激的多单位反应，获得了直接证据，表明该区域位于上丘专门用于面部表征和中央视觉的功能区内。结果还表明，该区域外侧比内侧产生更多的连合纤维，并且许多纤维连接上丘中的对应点。除了顶盖间连接外，连合投射还包含交叉轴突，这些轴突终止于被盖结构以及直接位于动眼神经复合体上方的中央灰质的一个受限区域内。结合连合投射在眼球和头部运动调节中可能发挥的作用对结果进行了讨论。
