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| Muscle, Smooth Muscle, Involuntary | Involuntary Muscle | Involuntary Muscles | Muscles, Involuntary | Muscles, Smooth | Smooth Muscle | Smooth Muscles Unstriated and unstriped muscle, one of the muscles of the internal organs, blood vessels, hair follicles, etc. Contractile elements are elongated, usually spindle-shaped cells with centrally located nuclei. Smooth muscle fibers are bound together into sheets or bundles by reticular fibers and frequently elastic nets are also abundant. (From Stedman, 25th ed) | |
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