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- W2164036959 abstract "The contribution of prolonged motoneuron axotomy to the poor functional recovery after delayed nerve repair was determined by means of a nerve cross-anastomosis paradigm in the rat. The tibial nerve was axotomized up to 12 months before it was cross-sutured to the distal stump of the freshly cut common peroneal nerve to innervate the freshly denervated tibialis anterior muscle. Three to 17 months later, muscle and motor unit (MU) forces were measured to quantify the number of axons that had successfully regenerated and reinnervated the muscle. The extent of axonal branching was estimated by the innervation ratio (IR) (i.e., the number of muscle fibers innervated by each axon), which was obtained directly by counting muscle fibers in a single glycogen-depleted MU in each muscle and indirectly by calculation. The total number of MUs in each muscle significantly decreased with progression of axotomy and was only 35% of the control when axotomy was prolonged more than 3 months. Concurrently, MU force and IR increased exponentially, with a mean increase of threefold when axotomy was more than 3 months, which largely compensated for the reduction in the number of axons that reinnervated the muscle. Consequently, muscles reinnervated by tibial motor axons that had been axotomized up to 12 months produced as much force as those reinnervated by freshly axotomized tibial motor axons. Muscle weight, size, and muscle fiber size were similar to those after immediate nerve suture. Although prolonged axotomy does not compromise the number of muscle fibers innervated by each axon, it does reduce the capacity of motor axons to regenerate and thus is an important contributing factor to the poor functional recovery in delayed nerve repair." @default.
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- W2164036959 date "1995-05-01" @default.
- W2164036959 modified "2023-10-14" @default.
- W2164036959 title "Contributing factors to poor functional recovery after delayed nerve repair: prolonged axotomy" @default.
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- W2164036959 doi "https://doi.org/10.1523/jneurosci.15-05-03876.1995" @default.
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