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
World Colored Light Heavyweight Championship one day short of a year later, on 8 Mary 1923, when he K.O.-ed Tiger Flowers in the at 2:50 in the first round of a scheduled 12-rounder in Springfield, Ohio. The title then went into abeyance. John Henry Lewis became the first black world light heavyweight champion in 1935. World Colored Light Heavyweight Championship The World Colored Light Heavyweight Championship was a title created in 1921, when African American boxers were prevented from contending for the world light heavyweight title by the color bar. On 30 May 1921, Kid Norfolk fought Lee Anderson for the new colored light heavyweight