involuntary muscles


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in·vol·un·tar·y mus·cles

muscles not ordinarily under control of the will; other than the heart, they are composed of smooth (nonstriated) muscle fibers, innervated by the autonomic nervous system.

in·vol·un·tar·y mus·cles

(in-vol'ŭn-tar-ē mŭs'ĕlz)
Those muscles not ordinarily under control of the will; except in the case of the heart, they are smooth (nonstriated) muscles, innervated by the autonomic nervous system.
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