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Fig. 1. Developing Drosophila visual system. (A) Horizontal view of
wild-type third instar visual system (anterior to left) of animal expressing
CD8:GFP under the control of Sca-Gal4 (Sca:GFP). GFP is expressed in
the OPC, IPC, medulla cortex and portions of the lobula cortex. Sca:GFP
(green). Neuronal nuclei are visualized using anti-Elav (blue); photoreceptor
axons, lamina monopolar axons and axons from neurons of the lobula cortex (a
subset of which contact the medulla neuropil) are visualized using
anti-Fasciclin 2 (Fas2) (red). Dotted line indicates anterior edge of lobula
cortex. (B) Lateral view (anterior at bottom) of Sca:GFP animal in which
neuronal nuclei have been visualized using anti-Elav (blue) and glial nuclei
using anti-Repo (red). Schematics of (C) horizontal view and (D) lateral view,
indicating cell populations and axons described in the text. ep, epithelial
glia; IPC, inner proliferation center; lamc, lamina cortex; lamn, lamina
neuropil; lobc, lobula cortex; ma, marginal glia; medc, medulla cortex; mg,
medulla glia; medn, medulla neuropil; OPC, outer proliferation center; os,
optic stalk.