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Fig. 10

(A) The MB primordia in the embryonic brain. Frontal view of the embryonic brain at late stage 16. Only major tracts are shown. Optic lobes are not included. (B,C) Layer organization of the second and third instar larval MBs. Dorsal images of Kenyon cell clusters and cross sections of the peduncle and lobes. Corresponding subdivisions are shown insame colors. Relative expression levels of various MB markers are summarized in the table. The second instar MBs can be concentrically subdivided in two layers surrounding the core. With increase in the numbers of the Kenyon cells and their projections,the third instar MBs can be subdivided into three layers surrounding the core. Note that the distoproximal concentric subdivisions of each of the four Kenyon cell clusters topologically correspond to the unified concentric subdivisions in the lobes and the peduncle. The core consists of a bundle of newly formed axon fibers that contain densely packed actin filaments. AF, actin filaments; ACT, antennocerebral tract; DCT, dorsal commissural tract; DNC, dnc-lacZ; KCs, Kenyon cells; LPT, lateral protocerebral tract; MPT,medial protocerebral tract; P1, P4l, P4m, and D/T, fiber tract founder clusters (Nassif et al., 1998); Ped, peduncle; VCT, ventral commissural tract.

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