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
What Is Love English pop charts, and was an international club hit almost a year ago. Wildly catchy chorus is complemented by a slick, synth-happy arrangement. Haddaway will conjure up images of Seal and Sydney Youngblood with his worldly baritone delivery. A sure-fire dance hit that has the muscle to push its way onto pop formats with ease." The "Gavin Report" wrote: "Try sitting still seconds after this upbeat entry kicks in. Still hot in the U.K. where it had a Top 10 run, Haddaway's style is reminscent of the Fine Young Cannibals and just as exciting." The music video of "What Is