Boĭko V P, Davydova T V
Zh Evol Biokhim Fiziol. 1977 Mar-Apr;13(2):192-7.
Studies have been made on.morpho-functional changes in the optic nerve and midbrain tectum after enucleation of the tortoise T. horsfieldi. It was found that intensive degeneration of terminals which follows "dark" type (3--31/2 months after enucleation) corresponds to degeneration of myelinated fibers. Terminals degenerating accordingly to "light" type (2--3 months) presumably belong to unmyelinated fibers, which degenerate at this period in the nerve. Terminals which follow "vesicular" degeneration, survive up to 6--61/2 months, probably due to survival of some unmyelinated fibers in the nerve. During degeneration of the optic fibers, corresponding changes in amplitude-temporal parameters of the evoked potentials in the midbrain tectum were observed during electrical stimulation of the optic nerve. These changes include the increase of the interval between the stimulus and the peak of both components, as well as the decrease of the amplitude of the responses. These changes were originally observed 11/2--2 months after enucleation, becoming more evident at later stages; 6--61/2 months after enucleation, both components of the evoked potential disappeared almost simultaneously.
对缅甸陆龟眼球摘除术后视神经和中脑顶盖的形态功能变化进行了研究。发现摘除眼球后3至3个半月出现的“暗”型终末密集变性，与有髓纤维变性相对应。按“亮”型（2至3个月）变性的终末，可能属于无髓纤维，此时神经中的无髓纤维发生变性。出现“泡状”变性的终末存活至6至6个半月，可能是由于神经中一些无髓纤维存活所致。在视神经纤维变性过程中，对视神经进行电刺激时，观察到中脑顶盖诱发电位的波幅-时间参数出现相应变化。这些变化包括刺激与两个成分峰值之间的间隔增加，以及反应波幅降低。这些变化最初在摘除眼球后1个半月至2个月观察到，后期变得更加明显；摘除眼球后6至6个半月，诱发电位的两个成分几乎同时消失。
