[Retinotopic organization of the lateral suprasylvian sulcus' posterior-medial area as revealed by analysis of the pattern of cortico-cortical connection with the cat 17th area].

Using cortico-cortical connection analysis technique, the cat visual area PMLS (the area located on posterior medial wall of the lateral suprasylvian sulcus) retinotopic organization was investigated. A retrograde axonal tracer: horseradish peroxidase (HRP), was injected in the PMLS, and initial neurons were investigated in area 17. It was shown that after HRP injection in PMLS locus, where a central vision field is located, a labelled cell pattern in area 17 corresponded to the L. Palmer et al., 1978, retinotopic map. On the contrary, after HRP injection in PMLS locus, where an upper vision field must be located, as L. Palmer et al., 1978 predicted, initial neurons are visualized in area 17 loci where low visual periphery is displayed: -10 degrees to -60 degrees in vertical meridian and 40 degrees to 80 degrees in horizontal meridian. Such discrepancy in upper and lower visual field representation was also obtained in electrophysiological and topographic investigations by Grant, Shipp, 1991. The data suggest necessity of S. Grant and S. Shipp's retinotopic map use in the cat area PMLS morphofunctional investigation.