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
What Is a Man Without a Moustache? Times" had also expressed opinions of a divided nature. He called the film "pleasant if inconsequential", offered an opinion that it contains "good-natured sensibility" and a "slightly fabulous tone" while still feeling like "magic realism, without the magic", and concluded his review by stating that "the pleasant pointless of it all is laced with a tantalizing tease of allegory suggested by the dialectical twins and the strain of mellow nationalism in the dialogue." Reviewing the film for "TV Guide", Maitland McDonagh awarded the film three stars out of four calling it "sardonic" and "absurdist". What Is a Man Without a