Das Reizleitungssystem des Säugetierherzens (English: "The Conduction System of the Mammalian Heart") is a scientific monograph published in 1906 by Sunao Tawara.
It was used by Arthur Keith and Martin Flack as a detailed guide in their attempts to verify the existence of the Bundle of His, which subsequently led to their discovery of the sinoatrial node.
[1] Tawara's monograph, titled "Das Reizleitungssystem des Säugetierherzens" (English: "The Conduction System of the Mammalian Heart") was published in 1906.
It was subsequently read by the Scottish cardiologist James Mackenzie and forwarded to anatomist Arthur Keith, who was attempting to confirm the existence of the Bundle of His.
He noted that it took ten years before anatomists began to pay attention to the bundle, starting with the studies of Retzer and Brauning in 1903, followed by the "important work of Tawara" in 1906, and the subsequent discovery of the sinus node which completed the system.