北草蜥中脑视叶组织学结构观察

用光学显微镜对北草蜥(Takydromus septentrionalis)中脑视叶组织学结构进行了观察。视叶分为背侧的顶盖和腹侧的被盖，两者无明显界限。顶盖处灰质和白质交替排列。由表及里，可分为分子层、外灰质层、浅白质层、中灰质层、中白质层、深灰质层、深白质层和室管膜层。被盖处细胞层次不明显。在视叶的前部有横行的纤维将左右视叶联系起来。左右视叶室与中脑水管以及两视叶间的纵沟在视叶的中、后部相通。同时将北草蜥的中脑与其它低等脊椎动物进行了比较，推测北草蜥在进化上处于较低等地位。

A Histological Study of the Optic Lobe in Takydromus septentrionalis

The histological structure of optic lobe in Takydromus septentrionalis was studied. The optic lobe could be divided into two parts: dorsal tectum and ventral tegmentum, but there was no distinct boundary between them. The white matter and the gray substance distributed alternatively. From lateral to medial, tectum consisted of 8 layers: molecular layer, outer gray layer, superficial white layer, middle gray layer, middle white layer, deep gray layer, deep white layer, and ependymal layer. The cell layers in tegmentum were indistinct. The left and right optic lobes were linked by the transversal fibers at the anterior part. The left and right optic lobes communicated with aqueduct of sylvius and vertical culcus at the mid-posterior part. The mesencephalon of T. septentrionalis was compared with other lower vertebrate animals. We speculate that T. septentrionalis lies at lower status in evolution.