Trismus is a motor disturbance of the trigeminal nerve.
In particular there is spasm of the masticatory muscles, with difficulty in opening the mouth - risus sardonicus or 'lockjaw' to the layperson.
Trismus is a characteristic early symptom of tetanus, but it may also occur secondary to acute infection, after an overdose of phenothiazines, and in disorders of the basal ganglia.
Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.