TABLE 1.Properties of hindlimb and pudendal motoneurons
|
|||
Property | Motoneuron |
||
Hindlimb | Pudendal | ||
|
|||
Resting potential, mV | –66.9 ± 12.3 | –59.8 ± 9.2** | |
AP amplitude, mV | 78.7 ± 8.9 | 77.2 ± 7.9 | |
Input resistance, mΩ | 5.1 ± 3.4 | 9.2 ± 4.8*** | |
Time constant, ms | 3.6 ± 2.3 | 4.4 ± 2.0 | |
AHP duration, ms | 45.5 ± 12.8 | 47.6 ± 11.2 | |
AHP half-time, ms | 17.2 ± 7.0 | 18.6 ± 5.8 | |
AHP amplitude, mV | –3.0 ± 2.0 | –4.3 ± 3.1* | |
Rheobase, nA | 4.3 ± 3.0 | 2.4 ± 1.9** | |
Threshold depolarization, mV | 18.2 ± 7.5 | 17.5 ± 6.5 | |
Number of cells | 32–35 | 49–57 |
Values are means ± SD. See text for motoneuron identification criteria. Amplitude of action potential (AP) elicited by brief
[0.4- to 1.3-ms (typically 0.6-ms) current pulse]. Threshold depolarization from resting potential required to elicit AP.
* P < 0.05,
** P < 0.01, and
*** P < 0.001, different from hindlimb motoneurons by t-test.