My neuro said spasticity and that they are fasciculations, and are a part of spasticity.
He said they are small muscle fibers or groups of fibers that are being affected. That's why sometimes it's like a spider walking and sometimes it's like you're having a baby!
Like Cherie said, at first they used to freak me out. Now I find them amusing, especially when other people can see them. They don't hurt and they roam my body at will. The only one I find annoying is the eye twitching, and like Cherie, I press on the twitch with my eye closed and for some reason it calms it most of the time.
They have lessened with Baclofen and Tysabri but they are still there, as is the spasticity. I am not on any other meds except the above, Provigil, calcium, Vit. D, fish oil and a baby aspirin.