Ein Experimenteller Beitrag Zum Subkortikalen Optischen System Von Tupaia Glis

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Abstract
Seven tree shrews (Tupaia glis Diard 1820) were subjected to left ocular enucleation and sacrificed 7-20 days later. In 5 of the brains the Nauta-Cygax technique was employed to explore the subcortical optic tracts and centers. Two of the enucleated preparations and 2 additional normal brains were cut and stained after the methods of Heidenhain-Woelcke, Kluver-Varrera, Nissl and Gomori and silver-impregnated according to Palmgren. No retino-hypothalamic fibers were found. An estimated 3% of the retinal fibers did not decussate in the chiasma; all of the latter terminated in the ipsilateral geniculate body. Approximately 20% of the optic fibers terminated in the dorsal nucleus of the lateral geniculate body. Some fibers passed through the ventral nucleus, but did not terminate there. Approximately 80% of the retinal fibers reached the rostral colliculus where they terminated in the stratum opticum, stratum griseum super-ficiale and stratum zonale. The contralateral nucleus praetectalis showed degenerations while the ipsilateral one was not affected. The accessory optic system was a "complete" one, i. e., consisting of the anterior accessory optic tract, the transpeduncular tract and its terminal nucleus. Degeneration was observed in the tracts and nucleus of the contralateral side only.