--a feeling of "twitching" can be related to compression along a nerve tract--I have intermittent twitching, somewhat positionally dependent, in the muscle in the forearm right above the elbow on the right side, which I believe is related to my documented right side c6-c7 radiculopathy secondary to arthritic spurring causing foraminal narrowing.

It's annoying, but not painful, and comes and goes. You can actually see the muscle twitch when it happens.

It's also possible to have what neurologists call benign fasiculations--occasional muscle twitches with no real observable cause beyond a slightly stronger than normal nerve signal going down the motor nerve from time to time. Still, given your history, it might be worth an exam and some localized neuromuscular testing.