Figure 7
taken from each of 20 neurons in individual areas. Expressed as the mean number of spines per 10-µm segment of single dendrites. Error bars denote SEM. (b–e) Cross tables showing the results of post hoc pairwise Tukey–Kramer method comparison of the distribution of the five spine types (F, filopodia; T, thin; S, stubby; M, mushroom; B, branched) in the M1 (b), SMA (c), PMd (d), and PMv (e). In these cross tables, asterisks indicate that the value for one spine type on rows is significantly higher than for other spine type(s) on columns. *p < 0.05, **p < 0.01. Note that both the filopodia and the branched types are quite a few or almost none in each of the motor-related areas, and that in the M1, SMA, and PMv, the density of thin- and stubby-type spines is comparable to each other and much higher than that of mushroom-type spines, but that in the PMd, the density of thin-type spines is significantly higher than those of stubby- and mushroom-type spines.
Distribution of dendritic spine types. (a) Density of five spine types in the basal dendrites of large layer V pyramidal neurons in the motor-related areas. Data on two dendrites
