Table 1.
Dendritic dimensions of reconstructed D1 and D2 MSNs
| D1 MSN (n = 15) |
D2 MSN (n = 16) |
|||
|---|---|---|---|---|
| Branch order |
Number |
Length (μm) |
Number |
Length (μm) |
| 1° Dendrite | 7.8 (±0.6) | 24.8 (±1.8) | 5.9 (±0.4) | 29.9 (±2.7) |
| 2° Dendrite | 12.4 (±1.0) | 48.5 (±3.9) | 9.9 (±0.8) | 47.7 (±3.6) |
| 3° Dendrite | 15.8 (±1.3) | 55.1 (±3.9) | 11.5 (±1.0) | 57.9 (±3.4) |
| 4° Dendrite | 12.7 (±1.1) | 59.8 (±4.2) | 8.3 (±1.1) | 60.9 (±8.5) |
| 5° Dendrite | 6.9 (±0.9) | 59.9 (±5.9) | 6.3 (±0.8) | 56.0 (±4.1) |
| 6° Dendrite | 4.4 (±0.8) | 59.7 (±4.7) | 4.9 (±0.7) | 58.9 (±10.3) |
| 7° Dendrite | 5.8 (±1.2) | 47.2 (±18.3) | 5.0 (±0.6) | 58.2 (±14.2) |
| Total tree | 471.8 | 378.8 | ||
Dendritic segments of 15 D1 and 16 D2 reconstructed MSNs were compared with respect to average number per neuron and segment length (reported as mean ± SEM). The absolute number of segments per cell was significantly higher in D1 MSNs than in D2 MSNs for 1–4° branch orders, but not significant once normalized to the number of primary dendrites. The total length of a dendritic tree emerging from a single primary dendrite was not significantly different between D1 and D2 MSNs. The space occupied by D1 MSNs was significantly larger, whereas that occupied by a D1 MSN dendritic tree was not significantly different from that of a D2 MSN. The total convex hull surface for D1 MSNs was significantly larger than D2 MSNs (D1 MSN, 105.7 mm2; D2 MSN, 89.6 mm2; p < 0.05), although the area per primary dendrite was not different (D1 MSN, 8.5 mm2; D2 MSN, 12.3 mm2).