Rodger J, Dunlop S A, Beazley L D
Department of Zoology, The University of Western Australia, Nedlands, Perth, Australia.
Vis Neurosci. 1998 Jul-Aug;15(4):677-84. doi: 10.1017/s095252389815407x.
The population of retinal ganglion cells which project ipsilaterally in the brain was examined in the fat-tailed dunnart, Sminthopsis crassicaudata, following injection of horseradish peroxidase into one optic tract. Retinae were examined as wholemounts and optic nerves as serial sections. In addition, visual fields were measured ophthalmoscopically. Ipsilaterally projecting ganglion cells were located temporal to a line which ran vertically through the middle of the area centralis and extended medially to define a ventrolateral crescent. Temporal to the naso-temporal division, a mean of 77% of ganglion cells projected ipsilaterally; these cells represented 20% of the total ganglion cell population. The magnitude and retinal location of the ipsilateral projection correlated with the extensive binocular field which measured 180 deg in the vertical (from 20 deg below the horizontal axis to 70 deg beyond the zenith) and 140 deg in horizontal meridian. Ipsilaterally projecting axons were restricted to the lateral third of the optic nerve along its length, sharing territory with contralaterally projecting axons.
在将辣根过氧化物酶注入一条视束后，对肥尾袋鼬（Sminthopsis crassicaudata）中向同侧投射至脑内的视网膜神经节细胞群体进行了研究。视网膜作为整装片进行检查，视神经则制成连续切片进行观察。此外，还用检眼镜测量了视野。向同侧投射的神经节细胞位于一条垂直线的颞侧，该垂直线穿过中央凹区域的中部并向内侧延伸，以界定一个腹外侧新月形区域。在鼻颞侧划分的颞侧，平均77%的神经节细胞向同侧投射；这些细胞占神经节细胞总数的20%。同侧投射的范围和视网膜位置与广阔的双眼视野相关，该双眼视野在垂直方向上为180度（从水平轴下方20度到天顶上方70度），在水平子午线上为140度。向同侧投射的轴突在视神经全长范围内局限于视神经外侧三分之一处，与向对侧投射的轴突共用该区域。
