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
Look at What the Light Did Now Look at What the Light Did Now Look at What the Light Did Now is a documentary/live album DVD/CD by Canadian indie pop artist Feist, first released in December 2010. The DVD comprises an 80-minute documentary directed by Anthony Seck, five music videos from 2007 album The Reminder, and a number of live performances recorded between 2007 and 2009, including covers of songs by artists such as Little River Band and Ron Sexsmith. The set's accompanying CD features live tracks and solo piano takes of tracks from "The Reminder", along with live covers of songs by artists such as The