Mydriasis iris sphincter, composed of circularly arranged muscle fibers, and the iris dilator, composed of radially arranged muscle fibers. The sphincter is innervated by (signaled by nerves of) the parasympathetic nervous system, and the dilator by the sympathetic nervous system. Sympathetic stimulation of the adrenergic receptors causes the contraction of the radial muscle and subsequent dilation of the pupil. Conversely, parasympathetic stimulation causes contraction of the circular muscle and constriction of the pupil. The mechanism of mydriasis depends on the agent being used. It usually involves either a disruption of the parasympathetic nerve supply to the eye (which normally constricts the
Widening participation Widening participation Widening participation (WP) in higher education is a major component of government education policy in the United Kingdom and Europe. It consists of an attempt to increase not only the numbers of young people entering higher education, but also the proportion from under-represented groups (those from lower income families, people with disabilities and some ethnic minorities). In this way it is hoped to redress the inequalities in participation between social classes. Widening participation is one of the strategic objectives of the Higher Education Funding Council for England (HEFCE). The issue of widening participation became a political issue after