Using a combined morpho-functional approach the author recently
found that polyinnervation of the neuro-muscular juction (NMJ) is
the critical factor for recovery of function after transection and
suture of the facial nerve. Since polyinnervation is
activity-dependent and can be manipulated, he tried to design a
clinically feasible therapy by electrical stimulation or by soft
tissue massage. First, electrical stimulation was applied to the
transected facial nerve or to paralysed facial muscles. Both
procedures did not improve vibrissal motor performance (video-based
motion analysis of whisking), failed to diminish polyinnervation
and even reduced the number of innervated NMJ to one fifth of
normal values. In contrast, gentle stroking of the paralysed
vibrissal muscles by hand resulted in full recovery of whisking.
This manual stimulation depends on intact sensory supply of the
denervated muscle targets and is also effective after
hypoglossal-facial anastomosis, after interpositional nerve
grafting, when applied to the orbicularis oculi muscle and after
transection and suture of the hypoglossal nerve. From these results
the authorconcludes that manual stimulation is a non-invasive
procedure with immediate potential for clinical rehabilitation
following facial nerve reconstruction. "
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