develops from has muscle origin has muscle insertion has muscle antagonist sphincter pupillae dilatator pupillae radial muscle of iris radiating fibers iris dilator dilator muscle of pupil NCIT:C32463 dilator pupillae muscle FMA:49158 pupillary dilator musculus dilatator pupillae BTO:0001371 dilator of pupil Wikipedia:Iris_dilator_muscle pupillary dilator muscle dilator pupillae radial muscle pupillary muscle pupil dilator MA:0001288 SCTID:280890008 musculus dilator pupillae dilator pupillae muscle UBERON:0001608 pupil dilator muscle A smooth muscle of the eye, running radially in the iris that functions as a dilator. [WP,unvetted]. musculus dilatator pupillae EMAPA:35286 iris dilator muscle iris neurectoderm ectoderm-derived structure iris smooth muscle