title: Ultrastructure of sinus venosus innervation in Petromyzon marinus.
mesh_terms: D000818:Animals; D001369:Axons / Q000166:cytology; D001485:Basement Membrane / Q000166:cytology; D002838:Chromaffin System / Q000166:cytology; D004721:Endoplasmic Reticulum; D004727:Endothelium / Q000166:cytology; D005347:Fibroblasts / Q000166:cytology; D005399:Fishes / Q000033:anatomy & histology*; D006321:Heart / Q000294:innervation*; D006325:Heart Atria / Q000166:cytology / Q000294:innervation; D006352:Heart Ventricles / Q000166:cytology / Q000294:innervation; D002479:Inclusion Bodies; D008854:Microscopy, Electron; D008870:Microtubules; D008928:Mitochondria; D009206:Myocardium / Q000166:cytology*; D009454:Neurofibrils; D009469:Neuromuscular Junction / Q000166:cytology; D012508:Sarcolemma; D012583:Schwann Cells / Q000166:cytology