retinal raphe

retinal raphe 

A horizontal line of demarcation, on the temporal side of the macula, separating the arcuate nerve fibres from the upper and lower retina. See papillomacular fibres; arcuate scotoma; Bjerrum's scotoma.
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The theory is accepted today and the arcs are believed to result from possible electrical discharge of ganglion cells in the retina in the papillo-macular region around the retinal raphe (Figure 2).