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observe the measurements of septal papillary muscles present in tricuspid valve of human heart. Measurements of septal papillary muscles in tricuspid valve gains utmost importance in cardiac surgeries because they are the causes of myocardial infarction in recent times because of its variations and detection of these causes by advent in modern technologies which will help in treatment of tricuspid valve diseases.

Materials and Methods: This study was carried out on 96 normal formalin fixed human heart specimens. Dissection was performed according to standard techniques. Septal papillary muscles were observed and length, width and thickness of each muscle are measured and documented.

Results: In the present study, numbers of septal papillary muscles were present with a frequency of 0-2, with most common appearance of 1 muscle in 67 hearts (69.8%) and least common incidence of 2 muscles in 6 hearts (6.3%). Septal papillary muscles were present in 73 (76%) hearts. In measurements, septal papillary muscle mean height was

he opening of a new field of surgical endeavour often arouses interest in the detailed study of the anatomy of the involved part of the body. As a result of such studies, current notions may be changed and extended so as to understand better. The impetus given to tricuspid valve surgery in the course of the last few years has prompted revision of our knowledge concerning the anatomy of the normal. In present study the morphometry of septal papillary muscles in tricuspid valve were studied and then compared with the works of many eminent scientists in this field.

The atrioventricularvalvular complex in both right and left ventricles consists of the orifice and its annulus, the cusps, the supporting chordae tendinae of various types and the papillary muscles. Tricuspid valve is made up of six major components: 1. Right atrial wall 2. Annulus 3. Three leaflets 4. Chordae tendinae 5. Papillary muscles 6. Right ventricular free wall.

Harmonious interplay of all these, together with the atrial and ventricular myocardial masses depends on the conducting tissues and the mechanical cohesion provided by the fibro elastic cardiac skeleton.

All parts change substantially in position, shape, angulation and dimensions during a single cardiac cycle. The papillary muscles were small muscle groups which were present in ventricular wall and attached to cusps of valve by chordae tendinae. They contract to prevent invert or prolapse of valve. There are 2 major and 1 minor papillary muscle in the right ventricle. The major papillary muscles are located in the anterior and posterior positions. The minor papillary muscles have a medial position along with several smaller and variable muscles attached to the ventricular septum.

Septal or medial papillary muscle: Is small, but typical and arises from the posterior septal limb of the septomarginaltrabeculae. It is often formed of several muscles of which one may be longer and more constant.

All the papillary muscles supply the chordae to adjacent components of the leaflets they support. The septomarginaltrabeculae (moderator band) is more or less isolated trabeculae of the bridge type, which extends from the interventricular septum to the base of the anterior papillary muscle in the lower part of the ventricle. It contains conducting myofibers from the right limb of the atrioventricular bundle 1 .

The study was carried out on 96 formalin fixed human hearts from patients who had died of nonvascular causes and were autopsied. No gross abnormality of the tricuspid valves was noted. Study was done without any grouping of specimens on the basis of sex and age. Dissection was performed according to standard autopsy techniques. The Tricuspid valve was opened by a scalpel knife cut passing from the right atrium to the apex of the right ventricle through the lateral or acute margin of the ventricle. The interior of the

heart was washed and all the blood clots were removed. The second cut was made along the anterior surface of the heart just left to the intra-ventricular groove from apex of the ventricle to annulus; care was taken not to damage the papillary muscles. Each muscle were measured by using Vernier callipers and documented.

The data were summarised using descriptive statistics like frequency (number of papillary muscles), mean, standard deviation, range and 95% confidence interval (measurement of papillary muscles). All the statistical calculations were performed using software SPSS for windows {Statistical Package for Social Service (SPSS) Inc, 2004, New York} version 13.0.

In the present study, number of septal papillary muscles was present with a frequency of 0-2. Maximum numbers of papillary muscles were 1 seen in 67 hearts (69.8%) and minimum numbers of papillary muscles were 2 seen in 6 hearts (6.3%). Septal papillary muscles were present in 73 hearts (76.1%). Maximum numbers of papillary muscles were 2 seen in 6 (6.3%) hearts and minimum number of muscles was only 0 seen in 23 (24%) hearts.

In measurements of papillary muscles, septal papillary muscle mean height was 0.7±0.22 cm, mean width was 0.48±0.16 cm and mean thickness was 0.34±0.12 cm respectively.

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The number, length and shape of papillary muscles and chordae tendinae in the right ventricle are variable. This can be of clinical significance, since the papillary muscles play an important role in right ventricle contraction by drawing the Tricuspid annulus towards the apex, thereby causing shortening of the long axis and the chamber becoming spherical for ejecting blood. 2 height of SPM was 0.7 cm ranged between 0.3 cm to 1.3 cm, mean width was 0.5 cm ranged between 0.2 cm

In the present study all the papillary muscles were measured for height, width and thickness. Mean to 0.8 cm and mean thickness was 0.3 cm ranged between 0.2 cm and 0.7 cm.

Comparison of this observation with other studies is as follows. Conclusion: The present study to understand the anatomy of the constituent parts of the tricuspid valve complex not only helped examination of these parts in cross sectional interrogation but also enhanced appreciation of valvular anomalies. Knowledge regarding high variability of papillary muscles in the valve is helpful in corrective treatment of congenital disease like Ebstein's disease and severe functional Tricuspid regurgitation. Any variation in the attachments of muscle and their number, size and shape or their absence may cause prolapse of the leaflets. Regurgitation is a consequence of deformity, shortening and retraction of one or more leaflets of the Tricuspid valve as well as shortening and fusion of the papillary muscles. 10 Volume XIV Issue I Version I Anatomical variations of papillary muscles would be useful in newer surgical techniques like papillotomy and commissurotomy in rheumatic lesions, Observations of mean height was significantly agreed with other workers but mean width is not in agreement with Gerola LR et al. possible reasons for this difference may be specimen number of the both the study and also racial and geographical difference. But