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 It Is to Burn "All Our Kings Are Dead" (2010), A Day to Remember's "What Separates Me from You" (2010), D.R.U.G.S.'s "D.R.U.G.S." (2011), and The Amity Affliction's "Chasing Ghosts" (2012). All songs written by Finch. Personnel per booklet. Finch Additional musicians Production Citations Sources What It Is to Burn What It Is to Burn is the debut album by American post-hardcore band Finch. Finch originally formed under the name Numb with Nate Barcalow on vocals, Alex Linares on guitar, Derek Doherty on bass and Alex Pappas on drums. Guitarist Randy Strohmeyer was invited to join Finch after they witnessed him play with his band