TECTOPONTINE PROJECTION IN CAT - EXPERIMENTAL ANATOMICAL STUDY WITH COMMENTS ON PATHWAYS FOR TELECEPTIVE IMPULSES TO CEREBELLUM
TECTOPONTINE PROJECTION IN CAT - EXPERIMENTAL ANATOMICAL STUDY WITH COMMENTS ON PATHWAYS FOR TELECEPTIVE IMPULSES TO CEREBELLUM
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DOI：
10.1002/cne.901490306
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发表时间：
1973-01-01
影响因子：
2.5
通讯作者：
BRODAL, A
中科院分区：
文献类型：
--
作者：
KAWAMURA, K;BRODAL, A
以下病变的不同大小和位置的上级丘的分布在脑桥核的退化纤维被确定在猫的Nauta和Fink和Heimer浸渍切片。上级丘只投射到同侧脑桥核的大部分背外侧核。在投射中似乎存在某种程度的局部排列，有3例一侧为上级丘，另一侧为下丘（分别是大脑听觉区或大脑视觉区）的病变，可以将上级丘的投射与上述其他结构的投射进行比较。下丘投射到脑桥背外侧核的一个区域，该区域与上级丘的区域有一定程度的重叠。在对P. Brodal进行更系统的研究后发现，听觉皮层的脑桥投射区与上级丘的脑桥投射区在很大程度上是一致的，而视觉皮层的脑桥投射区则完全不同，这些发现连同文献中的其他资料，这强烈地表明，视冲动的途径，以vermal视觉区的小脑通过上级丘和背外侧脑桥核。直接的顶盖小脑纤维或途径通过网状结构几乎没有参与这一过程。解剖学上有证据表明，视觉冲动还有另一条途径到达小脑：通过视觉大脑皮层和脑桥到达小脑半球。这与生理学的发现一致，并提示小脑中可能至少存在两个视觉区，解剖学数据表明，在上级丘及其在脑桥的投射区中，有充分的可能性整合视觉、听觉和其他冲动。
Following lesions of different sizes and locations of the superior colliculus the distribution of degenerating fibers in the pontine nuclei was determined in the cat in Nauta and Fink and Heimer impregnated sections. The superior colliculus projects exclusively to most of the dorsolateral nucleus in the ipsilateral pontine nuclei. There appears to be some degree of topical arrangement in the projection.Three cases with lesions of the superior colliculus on one side and of the inferior colliculus, the cerebral auditory or cerebral visual areas, respectively, on the other side, permit comparisons between the projections of the superior colliculus with those from the other structures mentioned. The inferior colliculus projects onto the dorsolateral nucleus of the pons in an area which overlaps to some extent with that of the superior colliculus. Confirming more systematic studies of P. Brodal it is found that the pontine projection area of the auditory cortex to a large extent coincides with that of the superior colliculus, while the pontine projection area of the visual cortex is entirely different.These findings, together with other data from the literature, strongly suggest that the pathway for optic impulses to the vermal visual area of the cerebellum passes via the superior colliculus and the dorsolateral pontine nucleus. Direct tectocerebellar fibers or pathways via the reticular formation are scarcely involved in this process. Anatomically there is evidence for another route for visual impulses to the cerebellum: via the visual cerebral cortex and the pons to regions in the cerebellar hemisphere. This is in agreement with physiological findings and suggests that there may be at least two visual areas in the cerebellum.The anatomical data show that there are ample possibilities for an integration of optic, acoustic and other impulses in the superior colliculus as well as in its projection area in the pons.