By D.N. Angelov, O. Guntinas-Lichius, K. Wewetzer, W.F. Neiss, M. Streppel
Facial nerve surgical procedure necessarily ends up in partial pareses, abnormally linked hobbies and pathologically altered reflexes. the cause of this "post-paralytic syndrome" is the misdirected reinnervation of objectives, which is composed of 2 significant parts. First, because of malfunctioning axonal counsel, a muscle will get reinnervated by means of a "foreign" axon, that has been misrouted alongside a "wrong" fascicle. moment, the supernumerary collateral branches rising from all transected axons at the same time innervate hostile muscle tissues and reason critical impairment in their coordinated task. because it is not often attainable to persuade the 1st significant part and enhance the assistance of numerous hundreds of thousands axons, the authors focused on the second one significant part and attempted to lessen the collateral axonal branching.
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Extra info for Axonal Branching and Recovery of Coordinated Muscle Activity after Transsection of the Facial Nerve in Adult Rats (Advances in Anatomy, Embryology and Cell Biology)
Following BBA plus excision of the ipsilateral infraorbital nerve the vibrissae “rose” to the level of the mouth and acquired a posterior orientation also at 10–14 DPO. However, all operated rats showed no sign of recovery of rhythmical whisking until 28 DPO, the end of the observation period. Inﬂuence of the Altered Input 37 Surgery Olfactory mucosa (OM), freshly prepared from deeply anesthetized syngeneic male rats, was cut in small pieces, brieﬂy rinsed in Hank’s balanced salt solution (HBSS; Life Technologies Overseas GmbH, Eggenstein-Leopoldshafen, Germany, Cat.
In a second experimental set, the degree of post-transectional axonal branching between six visually normal SD rats and six blind SD/RCS rats was compared using retrograde labeling with three different ﬂuorescent dyes applied simultaneously to three different branches of the facial nerve. In a third experimental set, the degree of post-transectional recovery of vibrissal motor performance between six visually normal SD rats and six blind SD/RCS rats was compared using video based motion analysis.
According to this scale sections with “no ﬂuorescence” received zero points and those with “very strong ﬂuorescence” 40 points. 3 Effect of Neutralization of Trophic Factors at the Site of Lesion on Axonal Branching Animals Group I consisted of 141 animals, which served to establish the portion of motoneurons whose axons branched after entubulation of the facial nerve into a silicone tube ﬁlled with neutralizing antibodies to neurotrophic factors. 34 Materials and Methods: Experimental Sets Surgery After an intraperitoneal injection of Ketamin/Xylazin, the zygomatic, buccal, and marginal mandibular rami of the facial nerve in intact rats were transected and the proximal stumps instilled with crystals of DiI, FG; and FB (Fig.