Iris dilator muscle Iris dilator muscle The iris dilator muscle (pupil dilator muscle, pupillary dilator, radial muscle of iris, radiating fibers), is a smooth muscle of the eye, running radially in the iris and therefore fit as a dilator. The pupillary dilator consists of a spokelike arrangement of modified contractile cells called myoepithelial cells. These cells are stimulated by the sympathetic nervous system. When stimulated, the cells contract, widening the pupil and allowing for more light to pass through the eye. It is innervated by the sympathetic system, which acts by releasing noradrenaline, which acts on α1-receptors. Thus, when presented with a threatening
Guided Muscle Guided Muscle Guided Muscle is a 1955 Warner Bros. cartoon in the "Looney Tunes" series featuring Wile E. Coyote and the Road Runner. Along with "The Grey Hounded Hare" and "Tugboat Granny", "Guided Muscle" was one of the three cartoons on the final episode of ABC's "The Bugs Bunny & Tweety Show", on September 2, 2000. In fact, it was the last cartoon seen in that episode. "Introduction": Wile E. Coyote is cooking some food in a tin bucket over a fire. He adds pepper and a drop of a brown liquid, and stirs the bucket and fishes out what