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
There Is a Light That Never Goes Out a single release by WEA to promote the "...Best II" compilation. The song reached number 25 on the UK Singles Chart, making it their last UK Top 40 appearance to date. Music critics consider "There Is a Light That Never Goes Out" to be one of the Smiths' finest efforts. Simon Goddard wrote, "In a straw poll among Smiths fans today, 'There Is a Light That Never Goes Out' would more than likely still come out victorious", which he credits to the "perfect balance" of Marr's compositional skills and Morrissey's lyricism. AllMusic's Tim DiGravina calls it "a standout among standouts