Fig. 7. Schematic models of MB dendritic elaboration/distribution patterns. (A) Frontal view of various representative MB neurons in the anterolateral clone. (B) An oblique section of the MB calyx from posteroventral to anterodorsal surface. The primary neurites of MB neurons are aligned in order on the posterior surface of the calyx such that late-deposited primary neurites are centrally localized within individual clones, as indicated by patterned arrangement of color patches in the curved strip. Broken lines show the junctions between neighboring clonal dendritic fields. The fourfold domain contributed by the dendrites of pioneer /ß neurons is outlined by the dash-dotted line. The space between the dotted line and dash-dotted line represents the two- to threefold domain that is exclusively innervated by early-born /ß neurons. For simplicity, one subtype of MB dendrites is shown in each clonal unit. Note that late-derived /ß dendrites, but not dendrites, are well restricted to individual clonal territories. The calyx is normally tilted forward on the medial side. AM, PM, PL and AL represent the anteromedial, posteromedial, posterolateral and anterolateral clonal units, respectively.

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