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
Colored Sands - were critical to the composition of "Colored Sands": Lemay placed "Colored Sands" in the context of Gorguts previous work by explaining that, beginning with "Obscura", the band "deliberately made an effort to not do such things as the fast Slayer beats, no more fast picking riffs and other ideas found on our second album "The Erosion of Sanity"". This prompted the band to develop what Lemay described as "a new musical language" that was first heard on "Obscura". However, Lemay noted that "Obscura" was essentially a "first draft of this new language", for which "the outcome is somewhat simplistic".