Table 1.

Quantification of dendritic and axonal length of excitatory spiny neurons in layer 4

	Mean	SD
Soma diameter (μm)	13.2	1.2
Number of dendrites	3.9	1.1
Mean dendritic length (μm)	468.0	92.1
Dendritic field span (μm)	194.1	39.2
Total axonal length (μm)	6404.8	2426.6
Horizontal field span of axons in layer 4 (μm)	302.3	146.5
Horizontal field span of axons in layer 2/3 (μm)	403.6	75.7
Vertical field span of axon (μm)	996.4	237.0

Because there were only two pairs of star pyramidal neurons, data from spiny stellate cells and star pyramidal neurons were pooled.