Table 1.
Three-dimensional inspective analysis of axons
| Feature | Total | Average1-a | Range |
|---|---|---|---|
| Axon segment length (n = 75) | 674 μm | 9.1 ± 2.0 μm | 4.0–12.8 μm |
| Varicosities/axon segment | 224/75 | 3.0 ± 1.4 | 0–6 |
| Intervaricosity spacing | 674 μm/224 | 3.0 μm | from 1.2 to >7 μmc |
| PSDs/varicosityb | 206/189 | 1.1 ± 0.7 | 0–4 |
| Mitochondria/varicosityb | 95/189 | 0.5 ± 0.6 | 0–3 |
| Mitochondria/axon segment | 95/75 | 1.3 ± 1.0 | 0–4 |
F1-a
All data here and elsewhere are given as mean ± SD. bBased on numbers of complete varicosities (see Results). cFor spacings >7 μm, the axon segment left the image stack before another varicosity was observed.