兔视神经纤维的交叉

THE CROSSED FIBERS OF THE OPTIC NERVES IN RABBITS

动物视神经纤维交叉的多少,一般认为与动物的演进程度有关,就是低级动物,如哺乳类以下动物,视神经纤维都全部交叉;高级动物,都是部分交叉的。三十多年前Brou-wer[1]提出视神经纤维交叉的多少与动物的眼睛位置有失,就是双眼视觉的成分愈多的,视神经纤维不交叉的也愈多。并举出狗和猫同为食肉类动物,而狗眼的位置分在头的两边(双眼视觉成分较少)其视神经纤维不交叉的数目就比猫少。

The crossed and uncrossed fibers of rabbit’s optic nerves were counted and analysedin the sections prepared according to the method of Weber.The results show that thetotal number of fibers of each of the optic nerves is about 256,000,of which 89.6%are crossed fibers and 10.4%uncrossed.The presence of a fairly large number of un-crossed optic fibers may be an anatomical reflection of the development of the binocularvision in the rabbit.