Krackersones, I do have palmaris brevis spasm too it is the same like the picture that you mentioned.I twitch constantly in my feet,specially the arches but other areas too every day avery minute, I twitch my toes evey day every minute, the palmaris brevis too, then I have random twitches today in legs other day in lips, eye, calves ,nose and some other places too but not every day , even most of the days I only twitch feet, toes and palmaris brevis not other twitches.