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
Batman: The Widening Gyre release the remaining issues as a separate series to be called "Batman: Bellicosity", that was due in 2014, but to date, remains unreleased. In May 2009, it was announced that "Batman: The Widening Gyre" would be written by Kevin Smith and illustrated by Walt Flanagan. Months earlier, both had completed "". As Smith explained it, the series will have 12 issues split into two six-issue books. Book 1 was supposed to run from August 2009 to January 2010 and, after a six-month hiatus, Book 2 would run from July 2010 through December 2010. However, Book 1 was plagued by several