Iris sphincter muscle Iris sphincter muscle The iris sphincter muscle (pupillary sphincter, pupillary constrictor, circular muscle of iris, circular fibers) is a muscle in the part of the eye called the iris. It encircles the pupil of the iris, appropriate to its function as a constrictor of the pupil. It is found in vertebrates and some cephalopods. Initially, all the myocytes are of the smooth muscle type but, later in life, most cells are of the striated muscle type. Its dimensions are about 0.75 mm wide by 0.15 mm thick. In humans, it functions to constrict the pupil in bright light (pupillary light
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".