Botulinum toxin can spread to the length of thirty–forty five mm within the injected muscles towards the adjacent muscles, even when these muscles are divided by fasciae. Neck muscles are susceptible to diffusion of botulinum toxin, and paralysis of the wrong muscles contributes to dysphonia, dysphagia or dystonia. Mild https://botulinum-toxins85172.corpfinwiki.com/9031534/comparison_of_botulinum_toxins_fundamentals_explained