Figure 4.

Postmetamorphic animals still possess branched receptor neuron axons with multiple glomerular connections. Axonal bifurcations and multiglomerular innervations persist both in the postmetamorphic main olfactory system (A,B) and accessory olfactory system (C). Filled arrowheads indicate axonal branching points; open arrowheads indicate connections to glomeruli. D, Comparison of average axonal branching points and connected glomeruli in the larval (n = 27) and postmetamorphic accessory OB (n = 4), and the larval (n = 21) and postmetamorphic main OB (n = 20). Error bars indicate SEM; statistical significance was tested using an unpaired t test. n.s., Not significant. E, Three-dimensional reconstruction of an axon bifurcating three times before ending in three separate tufted glomerular structures.