Table 3.
Channel Distribution. Case I: apical dendrite supports Na+-mediated backpropagation but not Ca2+spikes; and Case II: apical dendrite supports both Na+-mediated backpropagation and Ca2+spikes
| Case I | Case II | |||||
|---|---|---|---|---|---|---|
| Trunk | Branches | Tuft | Trunk | Branches | Tuft | |
| Na | 12 | 6 | 2 | 12 to 8* | 6 | 2 |
| KDR | 4.5 | 3 | 1 | 4.5 | 3 | 1 |
| KA | 5 | 3 | 3 | 2 to 4* | 3 | 3 |
| Ca | 2 | 0 | 0 | 5.3 | 2.6 | 1.3 |
| KCa | 1 | 0 | 0 | 4 | 4 | 2 |
| KmAHP | 0 | 0 | 0 | 5 | 4 | 2 |
*
The range refers to a gradient of density in the apical trunk from soma outward (see Methods for rationale).
All channel conductance densities are expressed in mS cm−2 and assume open probability at 100%.