Figure 24. The number of neurons per glomerulus varies for each columnar neuron type.

(A) Number of neurons per protocerebral bridge (PB) glomerulus for each of the PB-EB neuron types. (B) As in (A), for the PFGs, PFL, and PFR neurons. (C) As in (A), for the PFN neurons. The irregular PFNp_d neurons have minimal arborizations in the PB.

Figure 24—figure supplement 1. Neuron types with more instances in a glomerulus have fewer total input or output synapses per region of interest (ROI).

(A) The total number of input and output synapses per ROI for the EPG neurons as a function of the protocerebral bridge (PB) glomerulus in which those neurons arborize. (B) The total number of input and output synapses per ROI for the EPG neurons as a function of the number of EPG neurons per glomerulus. The points were jittered by up to ± 0.2 to either side of their vertical centerline for ease of visualization. (C) For each neuron type, individual neurons were grouped according to how many neurons of that same type arborize in that neuron’s PB glomerulus. The mean total input (output) synapse count was then calculated and normalized by the mean total input (output) synapse count for the neurons with the fewest number of instances per glomerulus. This normalized total synapse count is displayed as a function of the numerosity factor. The numerosity factor is the ratio of the number of instances per glomerulus for the given glomerulus divided by the fewest number of instances across all glomeruli. The dotted line is the function y = 1/x. The points in the fan-shaped body (FB), noduli (NO), and PB input plots and the FB and NO output plots were jittered by up to ±0.05 to either side of their vertical centerline for ease of visualization.