Anatomical Observation of the Interventricular Septum in Pig Heart

To observe the anatomical structure of the muscular and membranous interventricular septum of pig heart and further provide data for comparative anatomy and cardiac xenotransplantation,the gross anatomical observation of muscular and membranous interventricular septum was conducted on 56 pig hearts which were fixed by 100 mL/L formaldehyde for 48 h.From the right muscular interventricular septum,the lengths of inflow tract and outflow tract were 65.47 mm±7.28 mm and 100.95 mm±9.81 mm,the lengths of anterior edge,posterior edge,and superior edge were 126.14 mm±16.14 mm,71.28 mm±12.07 mm and 75.12 mm±10.55 mm,and the thickness of inflow,outflow and trabeculae carneae tract were 18.04 mm±3.65 mm,20.16 mm±3.83 mm and 20.90 mm±4.60 mm,respectively.The area of the muslcular interventrical septum was 3 584 mm2±655 mm2.The membranous interventricular septum could be divided into three types by shape: triangular,quadrangular,and other shapes,whose occurrence rate were 60.72%,21.43% and 17.85%,respectively.The longest distance between tricuspid valve annulus and lineae of cuspis medialis was 7.23 mm±1.84 mm.The pig's muscular interventricular septum is similar with that of human being in the shape and structure,partly different in size.Moreover,The pig's membranous interventricular septum is located upper than the cuspis medialis and it is smaller than that of human being.The proprtions of membranous shape are different between pig and human.