Figure 5.

Thalamic inputs but not intracortical inputs specifically synapse on stubby dendritic spines. a, Morphological types of dendritic spines found on thalamorecipient pyramidal neurons are classified as follows: a1, long mushroom; a2, short mushroom; a3, long stubby; a4, short stubby; and a5, filopodia. Scale bar, 0.5 μm. b, c, Frequency histograms showing the percentage of thalamic (b; n = 37), intracortical (c; n = 272), L1 (c1; n = 145), L2/3 (c2; n = 83), and L4 (c3; n = 44) inputs synapsing on the five morphological types of dendritic spines.