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Figure 4 Cross-sectional view of a rat’s left ventricle (LV) when viewed along the short axis. The cross section obtained from the midsegment of the interventricular septum has been viewed from the basal end of the LV. The fiber sheets (dashed arrows) are seen to diverge away from midwall (hematoxylin and eosin stain) (A). The cleavage planes (arrow) separating the myofiber sheets are distinctly appreciated using high-resolution confocal laser scanning micrograph (B) magnification. Scale bar in B = 200 µm. RV = right ventricle.