title: Ultrastructural features of cardiac muscle cells in a tarantula spider.
mesh_terms: D000818:Animals; D003386:Brachyura / Q000033:anatomy & histology; D033364:Decapoda / Q000033:anatomy & histology; D006321:Heart / Q000294:innervation; D006654:Histology, Comparative; D008854:Microscopy, Electron; D008931:Mitochondria, Muscle; D009206:Myocardium / Q000166:cytology*; D009210:Myofibrils; D008121:Nephropidae / Q000033:anatomy & histology; D009457:Neuroglia; D009469:Neuromuscular Junction; D010210:Papillary Muscles / Q000166:cytology*; D012508:Sarcolemma; D012519:Sarcoplasmic Reticulum; D013112:Spiders / Q000033:anatomy & histology*; D013570:Synaptic Membranes; D013572:Synaptic Vesicles