title: Proceedings: Structures of physiological interest in the sphincter pupillae.
mesh_terms: D000818:Animals; D006168:Guinea Pigs; D007498:Iris / Q000648:ultrastructure; D008928:Mitochondria / Q000648:ultrastructure; D009130:Muscle, Smooth / Q000098:blood supply / Q000294:innervation / Q000648:ultrastructure*; D009210:Myofibrils / Q000502:physiology; D011680:Pupil; D012519:Sarcoplasmic Reticulum / Q000648:ultrastructure