Aside from the nerve fibers which enter the pace-making node from the subepicardium, there were observed within the limits of the node a few ganglionic cells and a plexus of moniliform nerve fibrils in very close relation to its muscle fibers, hence the sino-auricular node, like the auriculo-ventricular, may be considered from a histological standpoint a neuromuscular organ.
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Copyright, 1912, by The Rockefeller Institute for Medical Research New York
1912
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