Table 3.
Innervation and activation patterns of “all-slow” IFIB muscles in rotated limbs
| Embryo | Activation pattern | Innervation | St. |
|---|---|---|---|
| LR1 9-10 | SART | 1, 2* | 32 |
| LR1 12-5 | SART | 1, 2* | 33 |
| LR4 11-30 | SART | 1, 2 | 34.5 |
| LR1 9-12 | SART | 1 | 35 |
| LR3 3-22 | aITIB (slow region) | 1, 2* | 35 |
| LR3 9-6 | SART | 1, 2* | 35.5 |
| LR3 11-30 | SART | 1, 2* | 35.5 |
| LR3 9-18 | SART | 1 & 2, 3 | 36 |
| LR3 12-5 | SART | 1, 2 | 36 |
| RL2 12-13 | SART | 1* | 36.5 |
Underlined, bold numbers indicate the LS nerve that contained the predominant number of motoneurons innervating the muscle as deduced from electrical recordings. *, Innervation estimated by visual localization of twitch contractions. “&” indicates simultaneous stimulation of both LS nerves when it was not possible to stimulate each separately (see Materials and Methods for additional details). SART, Sartorius; aITIB, anterior iliotibialis.