You searched for: “visceral muscles”
visceral muscle (s) (noun), visceral muscles (pl)
Smooth or involuntary tendons that function to produce movements as parts of the body: The visceral muscles consist of fibers which move the internal organs; such as, the digestive tract, blood vessels, and the ducts leading from the glands.
No one has any conscious control over the visceral muscles.
While the skeletal muscle fibers are arranged in bundles, the smooth visceral muscle forms sheets of fibers as it wraps around tubes and vessels.