The developing ommatidia are evident as tiny clusters in the posterior portion of the disc. The mature Bolwig nerve traverses the eye disc along its equator. Upper right panel , Confocal micrograph of the basal portion of the same disc. Ommatidial fibers project posteriorly into the optic stalk.
Glial cells immigrating from the optic stalk take residence in the basal layer of the eye disc.
Lower right panel , Merging of the upper right and lower left panels.