title: The fine structure of thin unmyelinated axons within muscle spindles.
mesh_terms: D000818:Animals; D002415:Cats; D004298:Dopamine / Q000032:analysis / Q000378:metabolism; D005725:Ganglia, Autonomic; D006651:Histocytochemistry; D002479:Inclusion Bodies; D008566:Membranes; D008854:Microscopy, Electron; D009470:Muscle Spindles / Q000166:cytology* / Q000378:metabolism / Q000502:physiology; D009132:Muscles / Q000033:anatomy & histology / Q000294:innervation* / Q000502:physiology; D009186:Myelin Sheath; D009469:Neuromuscular Junction / Q000033:anatomy & histology; D013564:Sympathetic Nervous System / Q000033:anatomy & histology* / Q000502:physiology
chemical_list: D004298:Dopamine