Rheumatoid arthritis (RA) is a common condition affecting around 1% of the population. Around 90% of patients with RA have cervical spine involvement with between 11% and 58% of these patients having neurological involvement.3,4 Many of these patients have cervical myelopathy.
Pinworms are a type of parasite that lives in the digestive system of humans. They are common throughout the world. Adult pinworms are about 0.5 in. (12.7 mm) long and look like little white threads. Pinworm eggs are so tiny, you'd need a microscope to see them.
There are also mollusk 'worms', or worms from the Cnidaria phylum (jellyfish). As for insects, many larvae have the body shape of a worm. Since the term is solely based on body features, I think that any animal that looks like a worm, IS a worm, in the language of the general public. I don't think that non-animal species with a worm-like shape are still being called 'worms'.