Abstract
Despite a lot of research aimed at clarifying the mechanism of action of botulinum toxin, mostly at supraspinal levels, a complete understanding of it is still elusive. However, recent investigations, including our own, allow us to suggest that, in facial muscles, the effects of botulinum toxin are not only in the neuromuscular junctions affecting the acetylcholine release but also modify the sensory inflow with subsequent changes on the muscle spindle-gammamotoneuron system.
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