RT Book, Section A1 Berkowitz, Aaron L. SR Print(0) ID 1160203825 T1 Pupillary Control and Approach to Anisocoria Cranial Nerves 2 and 3 T2 Clinical Neurology and Neuroanatomy: A Localization-Based Approach YR 2016 FD 2016 PB McGraw-Hill Education PP New York, NY SN 9781259834400 LK neurology.mhmedical.com/content.aspx?aid=1160203825 RD 2024/10/14 AB Pupillary constriction is a parasympathetic function and pupillary dilation is a sympathetic function (“wide eyed with fear”). The pupils constrict in response to light and accommodation, and dilate in response to darkness and adrenergic states. Pupillary asymmetry is referred to as anisocoria, and can be caused by a variety of neurologic and ophthalmologic conditions. Changes in pupil size can also be caused by medications. Miosis refers to an abnormally constricted pupil, and mydriasis refers to an abnormally dilated pupil (mnemonic: mydriasis is a longer word than miosis, and mydriasis refers to the larger pupil size [i.e., dilated]).