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The ox atrioventricular conduction axis compared to human in relation to the original investigation of sunao tawara

Lookup NU author(s): Professor Bob Anderson


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© 2019 Wiley Periodicals, Inc.It was Sunao Tawara who, in 1906, established the foundations for knowledge of the arrangement of the atrioventricular conduction axis in man and other mammals. Study of the hearts of ungulates was a central part in his investigation, which assessed other species, including man. He described several subtle differences between the mammals. We have now ourselves studied the cardiac conduction tissue of the ox heart, comparing our findings with our knowledge of the arrangement in man, and providing new insights into the differences illustrated by Tawara. It is, perhaps, surprising that these differences, although subtle, have not attracted more attention. We show that the major difference is the fact that the noncoronary aortic sinus in the ox heart is mainly supported by the myocardium of the ventricular septum, whereas in the human heart the sinus, and its leaflet, are in fibrous contiguity with the aortic leaflet of the mitral valve. It is this feature that determines the difference in the arrangement of the conduction axis between the species. We also show that the emergence of the left bundle branch on the left ventricular aspect of the muscular septum is more variable than previously described. Clin. Anat., 2019. © 2019 Wiley Periodicals, Inc.

Publication metadata

Author(s): De Almeida MC, Sanchez-Quintana D, Davis N, Charles FR, Chikweto A, Sylvester W, Loukas M, Anderson RH

Publication type: Article

Publication status: Published

Journal: Clinical Anatomy

Year: 2020

Volume: 33

Issue: 3

Pages: 383-393

Print publication date: 09/03/2020

Online publication date: 21/11/2019

Acceptance date: 15/11/2019

ISSN (print): 0897-3806

ISSN (electronic): 1098-2353

Publisher: John Wiley and Sons Inc.


DOI: 10.1002/ca.23524

PubMed id: 31749249


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