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) Ghetto Supastar (That Is What You Are) "Ghetto Superstar (That Is What You Are)" is a song by American rapper Pras, featuring rapper Ol' Dirty Bastard and R&B singer Mýa. It was released on June 6, 1998. The track samples Kenny Rogers and Dolly Parton's 1983 single "Islands in the Stream" and was produced by Wyclef Jean and Jerry 'Wonda" Duplessis for Pras' debut solo studio album, "Ghetto Superstar". It was also featured on the soundtrack for the 1998 film "Bulworth". The song's writers are Prakazrel Michel, Wyclef Jean, Russell Jones, Barry Gibb, Robin Gibb, and Maurice Gibb. The song