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Fig. 2. (Top) Schematic drawing shows the cardiac ganglion and the right (r) and left (l) CI, CA1 and CA2 nerves joining the cardiac ganglion (CG) in the anterior part of the heart. (A–D) Photographs of the the outlined areas in the top diagram, showing the cardiac ganglion and cardioregulatory nerves in the cardiac ganglion trunk (CGT) in the anterior region of the heart stained with Methylene Blue. Neural branch (NB) from the trunk of the CG extends to the myocardium. AA, anterior artery; LA1to LA5, The 1st to 5th lateral arteries. Scale bars, 50 µm.