Botulinum toxin can spread to a distance of thirty–forty five mm in the injected muscles to your adjacent muscles, whether or not these muscles are separated by fasciae. Neck muscles are prone to diffusion of botulinum toxin, and paralysis of the wrong muscles results in dysphonia, dysphagia or dystonia. https://cashqhzhl.gynoblog.com/34739237/everything-about-botulinum-toxins-exotoxins-of-clostridium-botulinum