Figure 4. Morphological subtypes of labeled layer 1 neurons. A-D, Micrographs of representative cells for each subtype (horizontal, descendant, ascendant, and radial, respectively), alongside their respective representative polar histograms. The neuron in A exhibited a c-NAC firing pattern, the neuron in C exhibited a d-NAC firing pattern and the neuron in D exhibited a c-NAC firing pattern. Legends indicate the proportion of the total dendritic length of the compound population of each morphological subtype that occupies the referenced area. Note that for the descendant cells, half of the total dendritic length is concentrated in the area delimited by a 100° angle directly underneath the soma, indicating a marked downward distribution. Scale bar = 20 µm for all cells. c-NAC = classic non-accommodating cell; d-NAC = delayed non-accommodating cell.