dilator pupillae muscle

(redirected from Dilator pupillæ muscle)
Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to Dilator pupillæ muscle: Dilator pupillae

di·la·tor pu·pil·lae mus·cle

intrinsic so-called muscle of eyeball; radially disposed layer of muscular processes of the myoepithelial cells that form the epithelium of the posterior surface of the iris, which extends from the pupillary to the ciliary margin; sympathetic stimulation causes contraction, which slowly dilates the pupil to allow more light to reach the retina.
Farlex Partner Medical Dictionary © Farlex 2012