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
Ghetto Supastar (That Is What You Are) album "Running with Scissors". In August 2011, Taylor Swift covered "Ghetto Supastar" during the North American leg of her Speak Now World Tour. In each city, she chose to pay tribute to a homegrown artist. In Washington, D.C., she performed an acoustic version of "Ghetto Supastar", given that Mýa is from Washington, D.C. Swift referred to the song as her "seventh grade anthem". In 2017, singer/actress Vanessa Hudgens posted a video of herself singing "Ghetto Supastar" a capella on Instagram. Ghetto Supastar (That Is What You Are) "Ghetto Superstar (That Is What You Are)" is a song by American rapper