Myofilaments from Smooth Muscle.

Myofilaments have been found in the smooth muscle of the gut of the turtleand chicken. They resemble closely the corresponding filaments of skeletal and cardiac muscle, revealing a repeating period of about 400 Å, and ranging in diameter from 150 Å to 230 Å. Internlamentary material is also observed in smooth muscle; but is fairly evenly distributed, and not disposed in repeating bands, as in striated muscle.