Anatomical and Biometric Aspects of the Myocardial Bridges and Its Relationships with the Anterior Interventricular Artery and Adjacent Veins / Aspectos Anatomicos y Biometricos de Los Puentes de Miocardio y Sus Relaciones Con la Arteria Interventricular Anterior y Venas Adyacentes‪.‬

SOUSA-RODRIGUES, C. F.; ALCANTARA, S. F.; BUARQUE, G. L. C.; ROCHA, A. C.; ALENCAR E SILVA, R. & OLAVE. E. Anatomical and biometric aspects of the myocardial bridges and its relationships with the anterior interventricular artery and adjacent veins. Int. J. Morphol., 24(2):279-84, 2006. SUMMARY: The cardiac vessels are sometimes partly overlain by myocardial bridges, what has been subject of study by innumerous researchers. The present work has as objective to study the incidence of the myocardial bridges, its length and above which vessels they are preferencially. The material consisted of 30 hearts of adult individuals of both sexes, fixed in 10% formaldeyde solution. Myocardial bridges were found in 14 hearts (47%); about these, there were in 9 hearts (30%) muscle bridges only above the anterior interventricular artery; in 3 cases (10%) simultaniously over anterior interventricular artery and afluents of the anterior interventricular vein; in 1 heart (3%), it ocurred over left ventricular branches of the posterior interventricular artery and vein and in 1 heart (3%) over anterior ventricular branch of the right coronary artery. The length of the muscle bridges ranged from 9 to 55 mm. (mean 24.5 mm). We concluded that the incidence of the myocardial bridges is high and the vessel above which they are formed in greater frequency was the anterior interventricular artery in its middle portion and in minor percentages on adjacent veins.