Fig. 1.

Reconstructed dendritic trees of PV-, CB-, and CR-containing interneurons from the CA1 region of the rat hippocampus. Four examples are shown from each reconstructed cell population, illustrating the characteristics of branching patterns. Different types of dendritic segments separated on the basis of their diameter are indicated with different colors. Note the variance in the total length of dendrites of individual cells within a cell group and the differential distribution of dendrites in distinct layers for the three cell populations. Parvalbumin cells had the largest dendritic tree, and calretinin cells had the smallest. The horizontal extent of the dendritic tree was widest for calbindin cells and narrowest for calretinin cells. Scale bar, 50 μm. L.M., Stratum lacunosum-moleculare; S.R., stratum radiatum;S.P., stratum pyramidale; S.O., stratum oriens.