Table 1.
Ontogenic evolution of corrected resting membrane potential (Vrest) and spike threshold, membrane resistance (Rin) and capacitance (Cm) in lumbar spinal motoneurons (means ±s.e.m.)
| Developmental stages: | E13.5 | E14.5 | E15.5 | E16.5 | E17.5 | E18.5 | P0 |
|---|---|---|---|---|---|---|---|
| Spike threshold (mV) | −43.2 ± 2.7 | −41.3 ± 1.6 | −41.5 ± 1.8 | −41.6 ± 2.0 | −43.1 ± 0.7 | −40.8 ± 2.6 | −37.8 ± 0.8 |
| (n = 6) | (n = 13) | (n = 9) | (n = 8) | (n = 8) | (n = 4) | (n = 12) | |
| Vrest (mV) | −55.4 ± 1.3 | −64.8 ± 1.8 | −60.4 ± 5.4 | −65.0 ± 1.8 | −69.1 ± 1.2 | −66.3 ± 1.5 | −70.2 ± 1.0 |
| (n = 19) | (n = 6) | (n = 13) | (n = 16) | (n = 6) | (n = 18) | (n = 13) | |
| Rin (MΩ) | 945 ± 96 | 815 ± 98 | 383 ± 130 | 128 ± 34 | 146 ± 23 | 69.4 ± 11.1 | 41.4 ± 11.4 |
| (n = 12) | (n = 16) | (n = 16) | (n = 7) | (n = 13) | (n = 5) | (n = 7) | |
| Cm (pF) | 29.5 ± 3.6 | 37.5 ± 2.6 | 61.2 ± 7.7 | 128.3 ± 19.4 | 121.3 ± 12.1 | 158.2 ± 24.8 | 205.5 ± 15.1 |
| (n = 14) | (n = 16) | (n = 6) | (n = 7) | (n = 12) | (n = 5) | (n = 8) |