Figure 1

(A) Supertoroidal glyph field of the short axis of a normal mouse heart color-coded by the helix angle (HA). The LV myocardium has a large number of circumferential myofibers, some of which extend a short distance into the RV. However, the bulk of the RV free wall has few circumferential myofibers. (B-D) Magnified view of fiber architecture in the lateral wall (B) and septum (C) of the LV, and in the RV free wall (D). Supertoroidal glyphs are color-coded by HA and show the paucity of circumferential myofibers in the RV free wall and, in contrast, their abundance in both the septum and lateral wall of the LV.