Table 1.
Distribution of nicotinic receptor actions among the different layers in the CA1 region of the hippocampus
| Fast response (%) | Fast and slow response (%) | No response (%) | Total | |
|---|---|---|---|---|
| Stratum oriens | 26 (32) | 52 (63) | 4 (5) | 82 |
| Stratum pyramidale | 16 (44) | 2 (6) | 18 (50) | 36 |
| Pyramidal cell | 2 (13)* | 0 (0) | 13 (87) | 15 |
| Stratum radiatum | 21 (100) | 0 (0) | 0 (0) | 21 |
| Stratum lacunosum-moleculare | 16 (80) | 4 (20)** | 0 (0) | 20 |
* and ** indicate very small responses <15 pA when measured in voltage clamp at VH = −70 mV. As discussed in Results, neurons with both fast and slow responses are somewhat over-represented because these cells could be visually identified and selected later in the study.