MORPHOLOGY AND GROWTH OF THE VENTRICULAR MYOCARDIUM OF SOTALIA GUIANENSIS
Palavras-chave:
Boto-cinza, Coração, Morfometria, MicroscopiaResumo
Morphology, growth and aging of the heart, not only of Sotalia guianensis, but also of all cetaceans, are relatively unknown. The aim of the present study was to evaluate the morphology and growth of the heart and myocardium, using macro and micro-morphology, of samples collected from hearts of stranded Guiana dolphins found in the coast of Espírito Santo, Brazil. The ventricles were examined with light and electron microscopy, the hearts were measured and the volume density of cardiomyocytes, connective tissue, and blood vessels of the ventricles were determined. Statistical differences, regressions, correlations, and growth curves were applied between total length and age of animals and morphological variables. No significant difference was found between males and females. The histology and ultrastructure of the Guiana dolphin´s ventricles are similar to those found in other mammals. Type-I and -III collagen fibers were predominant in the myocardium. Total length and age correlated with select external morphometric variables such as the circumference at the coronary sulcus and the circumference at the distal third. Only the volume density of cardiomyocytes (r = 0.516) and connective tissue (r = -0.503) of the right ventricle correlated with age. The growth of height and circumference of the heart of S. guianensis occurs until approximately ten years of age, exceeding the physical maturity age reported for the species.
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