Arterial vascularization of the papilares muscles of the left ventricle of the dog´s heart (Canis familiaris - L. 1758) / Vascularização arterial dos músculos papilares do ventrículo esquerdo de cães (Canis familiaris - L. 1758)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

Cardiac irrigation, both in man and in other mammals, is a relevant subject that has been researched by several authors, among whom H. Rodrigues and his team, who have been seeking to subsidy the biomorphological base for myocardium vascular diseases. Information about the arterial vases related to papillary muscles is incomplete and scarce in the medical literature, in spite of their great importance. Aiming at establishing the origin of these arteries and their distribution through the papillary muscles in the left ventricle, we conducted our research using 30 adult dog hearts, both male and female, of undefined breeds and of several ages. After these species´ carcasses were donated by the Zoonosis Center, immediately after death, the animals? hearts were removed, isolated from the lungs and from the parietal pericardium, washed in running water, and then injected through the left coronary artery ostium with a colored vinyl acetate solution, with colored latex neoprene 650, or with 10% gelatin. The solution color varied in a few hearts according to the injected artery subdivisions. The papillary muscles were fixed with a 10% formaldehyde solution in all techniques that were used. Dissection was performed to reveal arterial vascularization. During the procedure, we used a 40% sulfuric acid solution to accelerate the process. To perform the X-ray, we used a mercury injection to help us to assemble the studied vascularization schemes, and we also used the Spalteholz technique to view cardiac irrigation better. We found that subauricular and subatrial papillary muscles are irrigated by the left coronary artery branches: the m. subauricular by the paraconal interventricular and circumflex branches and the m. subatrial predominantly by the circumflex branch. The sub-segments that supply the m. subauricular of the paraconal interventricular paraconal branch are the collateral and left ventricular, while sub-segments that supply the circumflex branch are the left dorsal and intermediate (marginal left ventricular) and, more rarely, the left ventricular edge branch (diaphragmatic branch). The sub-segments of the circumflex branch that supply the m. subatrial are the following branches: intermediate (marginal left ventricular), the left ventricular edge (diaphragmatic branch), right dorsal branches and the sub-sinuous interventricular branch. In a few cases, we also observed the collateral branch and the paraconal interventricular branch itself reaching the vertex portion of the m. subatrial. In 100% of the cases, anastomosis was observed between the branches that reach the cardiac apex: paraconal interventricular and its collateral sub-segment, over and beyond the circumflex branch sub-segments: intermediate branch (marginal left ventricular), the left ventricular margin branch, and the sub-sinuous interventricular branch.

ASSUNTO(S)

coração dogs artérias heart músculos artery cães muscles

ACESSO AO ARTIGO

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