Belekhova M G
Neirofiziologiia. 1977;9(5):486-94.
Thalamic structures relaying impulses originating from optic stimulation of the retina and electric stimulation of the tectum on the way to the general cortex, hyperstriatum dorsal ventricular ridge and striatum were studied in turtles Emys orbicularis. Anodal polarization of the n. rotundus temporarily, and the lesion of this nucleus irreversibly, suppressed the main negative component of responses evoked by tectal stimulation and light flashes in the dorsal ventricular ridge without affecting them in the general cortex. Polarization and lesions of the lateral thalamic region, including nucleus geniculatum lateralis produced an opposite effect. A conditioning single stimulation of the tectum or n. rotundus suppressed flash-evoked potentials in the hyperstriatum. However evoked potentials and single unit responses appeared following stimulation of the lateral thalamic region. They exhibited blocking interactions with the tectum-evoked responses. A conclusion is made that in the turtle the main pathways conducting visual information to the cortex and hyperstriatum are different: in the former case it is relayed in the lateral geniculatum region in the latter--in n. rotundus, although an overlap of the projections in dorsal ventricular ridge and striatum can be suggested.
在圆斑水龟中，研究了丘脑结构在将源自视网膜光刺激和顶盖电刺激的冲动传递至大脑皮层、上纹状体背侧室嵴和纹状体的过程中的作用。圆核的阳极极化会暂时抑制，而该核的损伤会不可逆地抑制顶盖刺激和闪光在背侧室嵴诱发反应的主要负成分，而对大脑皮层中的反应无影响。包括外侧膝状核在内的丘脑外侧区域的极化和损伤则产生相反的效果。对顶盖或圆核进行单次条件刺激会抑制上纹状体中的闪光诱发电位。然而，在刺激丘脑外侧区域后会出现诱发电位和单个单位反应。它们与顶盖诱发反应表现出阻断相互作用。得出的结论是，在龟中，将视觉信息传导至皮层和上纹状体的主要通路不同：在前一种情况下，它在外侧膝状核区域中继，在后一种情况下——在圆核中，尽管可以推测在背侧室嵴和纹状体中存在投射重叠。
