Mpodozis J, Letelier J C, Concha M L, Maturana H
Departamento de Biología, Facultad de Ciencias, Santiago, Chile.
Int J Neurosci. 1995 Mar;81(1-2):123-36. doi: 10.3109/00207459509015304.
The anatomical characteristics of the avian visual system are well known. However, there are wide gaps in our knowledge with respect to the physiological characteristics of their visual system. For example, we lack both an operational identification of the different ganglion cell types present in the retinae of birds, and a description of their presumptive differential central projections. The results presented here address this latter point by classifying the conduction velocity groups of fibers present in the optic tract of the pigeon. We report the existence of at least 5 groups of axons in the optic tract of the pigeon, with conduction velocities of 22-18 m/s, 12-10 m/s, 8 m/s, 6 m/s and less than 2.5 m/s. All five groups project to the tectum but only the four fastest groups project to the dorsal thalamic complex. The homologies with the populations of retinal axons found in cats are discussed.
鸟类视觉系统的解剖学特征已为人熟知。然而，我们对其视觉系统的生理特征却知之甚少。例如，我们既缺乏对鸟类视网膜中存在的不同神经节细胞类型的有效识别，也缺乏对它们假定的不同中枢投射的描述。本文给出的结果通过对家鸽视束中纤维的传导速度组进行分类，解决了后一个问题。我们报告在家鸽视束中至少存在5组轴突，其传导速度分别为22 - 18米/秒、12 - 10米/秒、8米/秒、6米/秒和小于2.5米/秒。所有这五组都投射到顶盖，但只有最快的四组投射到背侧丘脑复合体。文中还讨论了与猫视网膜轴突群体的同源性。
