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
There Is a Light That Never Goes Out the band's "comeback" record. However, Johnny Marr was insistent that "Bigmouth Strikes Again" be the band's next single. Despite Travis's advocation of the song, Simon Goddard expressed doubt that the song's "explicit glamorisation of suicide" would have endeared it to daytime radio. Regardless, "There Is a Light That Never Goes Out" became the second Smiths song to top BBC Radio One disc jockey John Peel's Festive Fifty poll in his 1986 tally. The song was shortly thereafter included on the 1987 compilation album "The World Won't Listen". In October 1992, "There Is a Light That Never Goes Out" finally received