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. Author manuscript; available in PMC: 2011 Nov 14.
Published in final edited form as: Neuron. 2010 Sep 23;67(6):1009–1020. doi: 10.1016/j.neuron.2010.08.014

Table 3.

Summary of measured neuropil parameters

Axon diameter (V1 & V3) 0.20 ± 0.06 μm
Dendrite diameter (V1 & V3) 0.67 ± 0.26 μm
Mean PSD area (V1) 0.054 μm2
Exponential decay constant of PSD area (V1) 0.047 μm−2
Mean spine head volume (V1) 0.038 μm3
Exponential decay constant of spine head volume (V1) 0.037 μm−3
Number of axons touching dendritic shaft per μm of dendritic length (V1 & V3) 6 ± 2
Number of axons per μm2 volume cross-section (V1 & V3) 7
Number of axons crossing a cylinder 1 μm from dendritic shaft surface per length of dendrite (V1 & V3) 22 ± 6
Volume density of synapses (V1, V3 & V4) 2.2 ± 0.5 μm−3