Figure 6.

Myofiber architecture from a DSI dataset in a normal rat heart viewed more finely using small spherical ROIs. The heart is viewed (A-E) from the LV apex and (F-J) from the lateral wall. Myofiber tracts in both the subendocardium (A, B) and subepicardium (D, E) have similar lengths and form a half-turn of a spiral. However, the myofibers in the subendocardium of the lateral wall (F, G) course from the postero-base towards the antero-apex while the fibers in the subepicardium of the lateral wall (I, J) course from the antero-base towards the postero-apex. The myofiber tracts in the mid-myocardium (C, H) are circumferential and have a length approximately equal to the circumference of the ventricle. Reproduced with permission from Sosnovik et al [27].