Mydriasis pupil) or overactivity of the sympathetic nervous system (SNS). Pupil diameter also increases in reaction to cognitive tasks requiring memory and attention, and this phenomenon is used as an indicator of mental activation (‘arousal’) in psychophysiological experiments . Natural release of the hormone oxytocin can cause mild to moderate mydriasis. Parasympathetic fibers travel with cranial nerve III, the oculomotor nerve, to innervate the circular layer of muscle of the eye (sphincter pupillae). Damage to this nerve typically manifests itself as mydriasis, because the sympathetic supply to the pupil, which causes mydriasis, remains unaffected, and therefore unopposed. Multiple central nervous system
What a Pleasure Stakes What a Pleasure Stakes The What a Pleasure Stakes is an American flat Thoroughbred horse race for two-year-olds held annually at Calder Race Course in Miami Gardens, Florida. It is currently an ungraded stakes race run over a distance of 8.5 furlongs on dirt. The race has traditionally been held during the Tropical at Calder meet, from late October through early January. This meet normally has some of the strongest stakes programs of Calder’s eight-month season. Due to permit disputes with Hialeah Park Race Track, the race was pushed back in 1987 and 1991 into the following year. Both of