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Additional resources for Axonal Branching and Recovery of Coordinated Muscle Activity after Transection of the Facial Nerve in Adult Rats
However, a myotopic organization of this subnucleus into a ventrolateral portion (for the superior buccolabial ramus) and a dorsomedial portion (for the inferior buccolabial ramus) was no longer evident (Fig. 8B). Accordingly, the number of motoneurons whose axons or axonal branches projected into the superior buccolabial ramus was lower than that in intact rats: only about 56% of all neurons in the lateral facial subnucleus projected into the superior buccolabial nerve. On the contrary, due to the misguided growth of axons (21%) 678±426A1–A3 (39%) 418±247 (23%) 416±288 (26%) 511±204 (29%) 312±238 (19%) (56%) 860±439A1 (48%) 1271±352 (69%) 1,004±393 (63%) 1,064±422 (60%) 1,266±263 (76%) (5%) (11%) 89±54 (8%) 172±84 (11%) 198±70 (13%) 164±115 (23%) 237±249 342±352A1 0 Superior + Inferior buccolabial nerves (100%) (100%) 1,667±243 (100%) 1,591±484 (100%) 1,772±375 (100%) 1855±581 (100%) 1776±476 1920±288 (100%) 1491±604 Buccal facial nerve Mean numbers and standard deviations of retrogradely labeled motoneurons, the axons of which project within the superior, inferior, or both buccolabial nerves in group A.
Employing the custom-made selective ﬁlter sets for FG and FB, we could differentiate and save separate digital images of FG (orange-red) and FB (blue) motoneuronal proﬁles. Our results showed that in intact rats the portion of double-labeled (FG+FB) motoneurons is about 90% (Table 2), which is reasonably close to the theoretical expectation of 100% double labeling. Pre- and Postoperative Labeling Our own experience shows that the best combination of ﬂuorescent retrograde tracers to study the accuracy of post-transectional muscle reinnervation is a preoperative labeling of the original motoneuronal pool by an injection of 1% FG into the target muscle, followed by a postoperative labeling of all motoneurons innervating the same target after surgery by an injection of 1% FB (Popratiloff et al.
Recordings were made with a negative-active electrode. On all traces, depolarization of the muscles was indicated by a negative deﬂection. To avoid interference from the excitation of other facial muscles, the reference (indifferent) recording electrode was placed at a site as close as possible to the recorded ipsilateral vibrissal muscles. However, this procedure could not always be performed perfectly. , the piloerector muscles and the levator labii superioris muscle, often receive a thin communicating branch from the marginal mandibular branch of the facial nerve (Semba and Egger 1986).