Pupillary response Pupillary response Pupillary response is a physiological response that varies the size of the pupil, via the optic and oculomotor cranial nerve. A constriction response (miosis), is the narrowing of the pupil, which may be caused by scleral buckles or drugs such as opiates/opioids or anti hypertension medications. Constriction of the pupil occurs when the circular muscle, controlled by the parasympathetic nervous system (PSNS), contracts. A dilation response (mydriasis), is the widening of the pupil and may be caused by adrenaline, anticholinergic agents or drugs such as MDMA, cocaine, amphetamines and some hallucinogenics. Dilation of the pupil occurs when the
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