Figure 7.

Spine morphologic distributions of humans and mice. A–C, Head volume, neck length, and neck diameter distributions in human (green, n = 2536) and mouse (blue, n = 251) complete spines (group A). Mann–Whitney U rank test, ***p < 0.001. D–F, Correlation between spine head and neck morphologic variables. The correlation coefficients (Spearman) are indicated for each graph. The asterisks indicate statistical significance; **p < 0.01, ***p < 0.001. Two-sided p-value for a hypothesis test whose null hypothesis is that the slope is zero, using Wald test with t distribution of the test statistic. Extended Data Figure 7-1 shows the results for the complete and repaired spines (groups A, C, and D). Extended Data Figure 7-2 shows the correlation between head volume and neck length separately for different ages and dendrites.