Table 4.
Synaptic densities on examined dendrite subclasses and somata
| Type | PV | CB | CR | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total | Excitatory | Inhibitory | GABA- positive (% of all) | Total | Excitatory | Inhibitory | GABA- positive (% of all) | Total | Excitatory | Inhibitory | GABA- positive (% of all) | |
| Lm M | 171.34 | 143.44 | 27.89 | 16.28 | + | + | + | + | 91.44 | 75.31 | 16.14 | 17.65 |
| Lm t | 155.72 | 126.75 | 28.97 | 18.60 | *** | *** | *** | *** | **** | **** | **** | **** |
| Rad T | 483.81 | 444.68 | 39.13 | 8.09 | 167.86 | 113.51 | 54.35 | 32.38 | 108.36 | 85.36 | 23.00 | 21.23 |
| Rad M | 432.68 | 416.01 | 16.67 | 3.85 | 103.41 | 75.44 | 27.97 | 27.04 | 111.97 | 93.93 | 18.04 | 16.11 |
| Rad t | 145.63 | 133.50 | 12.14 | 8.33 | 84.37 | 61.01 | 23.36 | 27.69 | 61.21 | 49.73 | 11.48 | 18.75 |
| Pyr M | * | * | * | * | ** | ** | ** | ** | 70.89 | 42.53 | 28.36 | 40.00 |
| Ori T | 612.94 | 568.45 | 44.49 | 7.26 | + | + | + | + | 96.09 | 66.39 | 29.70 | 30.91 |
| Ori M | 361.08 | 344.95 | 16.13 | 4.47 | 92.76 | 54.56 | 38.19 | 41.18 | 81.41 | 61.36 | 20.06 | 24.64 |
| Ori t | 348.54 | 325.08 | 23.46 | 6.73 | 72.45 | 51.48 | 20.97 | 28.95 | 45.87 | 37.89 | 7.98 | 17.39 |
| Total | 325.60 | 304.89 | 20.72 | 6.36 | 105.46 | 74.42 | 31.03 | 29.43 | 91.85 | 72.83 | 19.02 | 20.71 |
| Somatic | 58.79 | 40.70 | 18.09 | 30.77 | 30.72 | 12.75 | 17.97 | 58.49 | 25.77 | 14.22 | 11.55 | 44.83 |
Values are expressed as number of synapses per 100 μm length of dendrite and number of synapses per 100 μm2 membrane for somata. We did not sample those dendrite subclasses that contributed only minimally to the total dendritic length measured at the light microscopic level (see Results). When calculating the total input, these missing values were replaced by the closest match: *stratum oriens medium; **stratum oriens values of the appropriate thickness; ***stratum radiatum thin; ****stratum lacunosum-moleculare medium values used; +, cells do not posses this subclass of dendrite. Lm, str. lacunosum-moleculare; Rad, str. radiatum; Pyr, str. pyramidale; Ori, str. oriens; T, thick; M, medium; t, thin (dendrites).