title: Ultrastructure of the neurogenic heart of Limulus polyphemus.
mesh_terms: D003445:Crustacea / Q000033:anatomy & histology*; D004721:Endoplasmic Reticulum; D006329:Heart Conduction System / Q000166:cytology*; D008854:Microscopy, Electron; D009206:Myocardium / Q000166:cytology*; D009210:Myofibrils; D009434:Neural Pathways; D009469:Neuromuscular Junction; D009474:Neurons; D012508:Sarcolemma; D009435:Synaptic Transmission