Morphological heterogeneity among multiglomerular LNs. A, Projection of a 15 μm confocal Z-stack through the center of both antennal lobes showing the morphology of a representative LN filled with biocytin. A primary neurite enters the antennal lobes from the lateral side and arborizes throughout many glomeruli. B, An example of three different LNs that innervate anterolateral glomeruli to varying degrees. Each image is a projection of a 15 μm stack through the most anterior portion of the right antennal lobe. Scale bars: A, B, 20 μm. C, The spatial pattern of innervation density varies across different LNs. Density[as a percentage of the maximum (% of max) density for that LN] is plotted for four densely innervated glomeruli (VA2, DM1, DM6, V) and four glomeruli that are more sparsely innervated (VA1d, VA1lm, DA1, DL3).