Figure 5: (A) A photomicrograph of the terminal crest epicardium showing the subepicardium (double head arrow), the mesothelium (short arrow) , the collagen fibers (arrow heads) and the atrial purkinje like cell (long arrow) Stain: Green Masson's Trichrome Obj.x10 : Oc.x10. (B) High magnification of (Fig. 24) showing the atrial purkinje like cell Stain: Green Masson's Trichrome Obj.x40: Oc.x10. (C) showing the strongly PAS positive reaction of the subepicardium CT. and the atrial purkinje like cell Stain: PAS Obj.x10: Oc.x10. (D) High magnification of (Fig. 26) showing the atrial purkinje like cell; uninucleated (arrow) and binucleated (double arrow) Stain: PAS Obj.x40: Oc.x10.