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. 2014 Jul 23;9(7):e103306. doi: 10.1371/journal.pone.0103306

Table 1. Number of caudal periaqueductal gray (cPAG)-projecting retinal ganglion cells (RGCs) required to tile up the retinal surface.

Number of cPAG-projecting RGCs needed to tile up the retinal surface
Average dendritic field diameter (mm) 0.248±0.038
Average dendritic field area (mm2) 0.048
Number of cPAG-projecting RGCs 134
Retinal area (mm2) [11] 64
Number of cells needed to cover the entire retinal surface 1333

The calculations are used to determine the number of cPAG-projecting RGCs that are required to cover the whole retinal surface. The size of the retinal surface area is referred from Fite’s study [11]; tiling up the whole retinal surface is generally considered as a criterion for a type of RGC, and our results indicate approximately 1300 cPAG-projecting RGCs are required to cover the whole retinal surface in this species.