Fig. 4.

Connectivity in the larval mushroom body calyx. PNs receive olfactory input from OSNs in specific glomeruli of the AL, and send axonal projections to specific glomeruli in the MB calyx and to the lateral horn (not shown). In the MB calyx, larval KCs have dendrites ending in claw-like processes in ≈6 of 34 glomeruli, implying that information from ≈6 calyx glomeruli can converge to a single KC. KCs have a nonstereotypic arborization pattern. Even KCs that arborize in the same glomerulus have other arborizations in different sets of glomeruli (magenta and green KCs), implying that information from single PNs diverges to multiple KCs, where it is integrated with information from other PNs.