Table 2.
Active conductances
| Property | Smallest Motoneuron | Largest Motoneuron |
|---|---|---|
| Axon conductances, mS/cm2 | ||
| Na | 550 | 750 |
| Nap | 11 | 15 |
| Kdr | 400 | 400 |
| Soma conductances, mS/cm2 | ||
| Na | 44 | 44 |
| Nap | 0.44 | 0.44 |
| Kdr | 70 | 70 |
| H | 0.09 | 0.175 |
| KCa | 7.6 | 7.6 |
| Dendrite conductances, mS/cm2 | ||
| Na | 0.75 | 0.75 |
| Nap | 0.015 | 0.015 |
| Kdr | 0.33 | 0.33 |
| H | 0.09 | 0.175 |
| KCa | 0.04 | 0.04 |
| Cav1.3 | 0.16 | 0.16 |
Axon conductances are those of the initial segment and axon hillock, which have the same conductance densities. Na, transient sodium conductance; NaP, persistent sodium conductance; Kdr, delayed rectifier potassium conductance; H, HCN-mediated mixed cation conductance; KCa, calcium-activated potassium conductance; Cav1.3, low-threshold calcium conductance. Na, NaP, and Kdr conductance densities on the most proximal segment of the dendrite are the same as those on the soma; densities on the rest of the dendrite are shown. KCa density on the most proximal dendritic segment is one-half of that of the soma. Dendrite KCa and Cav1.3 densities shown are on a segment of the dendrite from 0.32 to 0.56 of the length away from the soma.