The EEG activity after lesions of the diencephalic part of the zona incerta in rats.

Acta physiologica Polonica Pub Date : 1990-11-01
E Jurkowlaniec, W Trojniar, J Tokarski
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Abstract

Neocortical and hippocampal EEG activity was recorded in 23 rats subjected to the bilateral electrolytic lesions of the diencephalic zona incerta (ZI). The aim was to find whether damage to ZI can replicate insomnia and disturbances in cortical EEG desynchronization and hippocampal theta rhythm found after lesions of the lateral hypothalamic (LH) area. No effect of the ZI lesions on waking-sleep cycle was found. The amplitude and frequency of cortical waves and hippocampal theta rhythm during waking were changed only in some rats. These changes were small, short-lasting and bidirectional (toward and increase or decrease in different subjects). Both the amplitude and frequency of paradoxical sleep theta were depressed in part of animals. Thus the marked EEG changes after LH lesions can not be attributed to simultaneous damage of the adjacent subthalamic region. However, the ZI seems to constitute a part of a larger system regulating cortical arousal and hippocampal theta rhythm.

大鼠中间带间脑部分损伤后的脑电图活动。
对23只大鼠双侧间脑不动带(ZI)电损伤后的大脑皮层和海马脑电活动进行了记录。目的是研究ZI损伤是否可以复制下丘脑外侧区(LH)损伤后出现的失眠、皮质脑电图失同步和海马θ节律紊乱。未发现ZI病变对清醒-睡眠周期有影响。只有部分大鼠清醒时皮层波的振幅、频率和海马θ波节律发生改变。这些变化很小,持续时间短,是双向的(在不同的受试者中增加或减少)。部分动物的矛盾睡眠θ波的振幅和频率都有所下降。因此,LH损伤后显著的脑电图变化不能归因于邻近的丘脑底区同时受损。然而,ZI似乎构成了一个更大的调节皮层觉醒和海马θ节律的系统的一部分。
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