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voluntary muscles include
arm and leg muscles
heart and stomach muscles
cardiac muscle
striated or skeletal muscle

Voluntary muscles are muscles that you can use or move whenever you want, as opposed to involuntary muscles (such as heart/cardiac muscles, as well as stomach muscles) which move on their own, regardless of what you want to do. Having this in mind, voluntary muscles include arm and leg muscles and striated or skeletal muscle.

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it