Representation of the visual field in the optic tract and optic chiasma of the cat

Experimental Brain Research
H AebersoldD Sanides

Abstract

The fibre arrangement in the optic chiasma (OC) and tract (OT) was investigated with anatomical and physiological methods. In silver impregnated material, principal fibre streams can be demonstrated. In the OC, fibre bundles from each eye cross in a regular basket weave pattern, but deviations of single fibres from the predominant stream are often seen. In the OT, fibres run essentially parallel, and crossings of individual fibres are mainly restricted to the periphery of the tract, or around capillaries. Fibres in the upper segment of the OT are of thin, in the lower segments of thick diameter. Individual fibres labelled by HRP injected in the lateral geniculate body (LGB) run essentially parallel over long distances. Ventromedially to the LGB, bifurcations are found with one branch entering the LGB, the other continuing. 57% of OT-fibres had a receptive field (RF) in the contralateral, 43% in the homolateral eye; 60% in the lower, 40% in the upper visual field; and 6% had a RF in the homolateral visual field, mostly near the vertical meridian. Fibres from the central area were underrepresented in our sample. Fibres from the two eyes were mixed. The RFs of consecutively recorded fibres showed a systematic progression only exce...Continue Reading

Citations

Jan 1, 1988·Anatomy and Embryology·U RagerA Kabiersch
Aug 19, 1983·Neuroscience Letters·U T Eysel, U Wolfhard
Jan 1, 1989·Visual Neuroscience·T Fitzgibbon, W Burke
Jun 15, 2007·Brain Research Reviews·Rodney J Douglas, Kevan A C Martin
Dec 15, 2012·The Journal of Comparative Neurology·Daniel T KashimaArmin H Seidl
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