Table 2.

Morphologic parameters of apical (n = 88) and basal (n = 163) spines from complete mouse spines (group A)

		Average ± STD	Median	Range
Head volume (μm3)	Apical	0.1875 ± 0.14	0.1441	0.0151–0.9041
	Basal	0.1832 ± 0.13	0.1468	0.0161–0.7097
Neck length (μm)	Apical	0.5627 ± 0.33	0.4994	0.0195–2.4059
	Basal	0.5467 ± 0.31	0.463	0.2074–2.2687
Neck diameter (nm)	Apical	295.86 ± 116	288.06	92.41–640.53
	Basal	278.55 ± 102	267.1	88.61–676.45

Since neck diameters below the resolution limit (∼200 nm) cannot be visualized using LM, these values correspond to those spines that were completely visualized (60%). Extended Data Table 2-1 shows the morphologic parameters values for the complete and repaired spines (groups A, C, and D).