Micrometric And Microanatomical Study of Papillary Muscles In Adult Human Hearts

Aim: To analyze histomorphometric features of papillary muscles in both ventricles of human heart. Materials & Methods: 50 human hearts specimens were used. H &E Stain and some special staining (trichrome) were made. Histotechnique procedure and Magnus pro histo analytic software was used to study morphometry. Results: The length of right anterior papillary myocyte mean of 39.25 μm ±11.95 and right posterior papillary myocyte length mean of 27.66 μm ± 5.09 and the length of septal myocyte mean of 34.15 μm ±7.13.The length of left anterolateral papillary myocyte mean of 42.54±6.45μm and length of left posteromedial papillary myocyte mean of 47.74 μm ± 9.99. In the present study width of right anterolateral papillary myocyte mean of 11.82μm ± 3.62 . Right posteromadial papillary myocyte width mean of 7.14μm ± 2.09 . The septal myocyte width mean of 9.72μm ± 2.54. The width of left anterolateral papillary muscle fibre mean of 9.76 μm ±2.61. In the present study perimeter of papillary muscle cell nucleus mean was 68.76 μm. Conclusion: The papillary myocyte size was smaller than the cardiac musclefibre including the nuclear size in majority of the cases the myocytes were binucleated and the nucleus was elongated.