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. 2015 Oct 20;30(3):e3426. doi: 10.1002/nbm.3426

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© 2015 The Authors. NMR in Biomedicine published by John Wiley & Sons Ltd.

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Myofibers in the heart form an array of crossing helices. Fiber tracts in a rat heart, created by sweeping a small spherical region of interest (ROI) across the myocardium, are shown. The heart is viewed (A–E) from the apex and (F–J) from its lateral aspect. The papillary muscles and endocardial trabeculations can contain highly longitudinal myofibers with an absolute HA > 60°. The fibers from the subendocardium to the subepicardium span a range of approximately 120° in most mammals. Reproduced with permission 22.