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
The Light That Failed The Light That Failed The Light That Failed is a novel by the Nobel Prize-winning English author Rudyard Kipling that was first published in "Lippincott's Monthly Magazine" dated January 1891. Most of the novel is set in London, but many important events throughout the story occur in Sudan and Port Said. It follows the life of Dick Heldar, an artist and painter who goes blind, and his unrequited love for his childhood playmate, Maisie. It is Kipling's first novel, written when he was 26 years old, and is semi-autobiographical; being based upon his own unrequited love for Florence Garrard. Though