Iris dilator muscle Iris dilator muscle The iris dilator muscle (pupil dilator muscle, pupillary dilator, radial muscle of iris, radiating fibers), is a smooth muscle of the eye, running radially in the iris and therefore fit as a dilator. The pupillary dilator consists of a spokelike arrangement of modified contractile cells called myoepithelial cells. These cells are stimulated by the sympathetic nervous system. When stimulated, the cells contract, widening the pupil and allowing for more light to pass through the eye. It is innervated by the sympathetic system, which acts by releasing noradrenaline, which acts on α1-receptors. Thus, when presented with a threatening
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