Figure 8

Density comparison of thin-, stubby-, and mushroom-type spines among frontal motor-related areas. (a–c) Density of thin-type (a), stubby-type (b), and mushroom-type (c) spines in the basal dendrites of large layer V pyramidal neurons in the motor-related areas. Expressed as in Fig. 7a. Error bars denote SEM. Tukey–Kramer method. *p < 0.05, **p < 0.01. Note that the density of stubby-type spines is much lower in the PMd than in the other areas. (d–g) Scatter plots of thin- and stubby-type spine morphology (length vs. width) for the M1 (d), SMA (e), PMd (f), and PMv (g). (h–j) Number of thin-type (h), stubby-type (i), and mushroom-type (j) spines on the proximal, middle, and distal segments of a single basal dendrite. Error bars denote SEM. *p < 0.05, **p < 0.01.