Figure 1. Low power images of fixed control rat lenses as seen under a stereo-view dissecting microscope.

The typical upright anterior Y suture pattern is readily apparent (A). Note that when a standard map of laser penetration points is overlain on such lenses, it can be seen that the 0-180° series of lasers will pass essentially directly along both the dorsal posterior (unseen) and ventral anterior suture branches (B). In contrast, the 90-270° series of lasers will pass essentially in between both the pair of dorsal anterior branches and the single ventral anterior branch, as well as between the single dorsal posterior branch (unseen) and pair of ventral posterior branches (unseen).