title: Fine structure, origin, and distribution density of the autonomic nerve endings in the sphincter and dilator muscles of the pupil of the mouse.
mesh_terms: D000818:Animals; D001341:Autonomic Nervous System / Q000648:ultrastructure*; D051379:Mice / Q000033:anatomy & histology*; D008815:Mice, Inbred Strains; D009132:Muscles / Q000294:innervation*; D009411:Nerve Endings / Q000648:ultrastructure*; D011680:Pupil