title: Fine structure of the sphincter and dilator muscles of the pupil of the mouse.
mesh_terms: D000818:Animals; D051379:Mice / Q000033:anatomy & histology*; D008815:Mice, Inbred Strains; D009130:Muscle, Smooth / Q000648:ultrastructure; D009132:Muscles / Q000648:ultrastructure*; D011680:Pupil