Myocardial atrio-venous junctions and extensions (sleeves) over the pulmonary and caval veins. Anatomical observations in various mammals.

نویسندگان

  • H Nathan
  • H Gloobe
چکیده

The myocardial fibres of the posterior wall of the atrio-venous junctions were examined in 35 large domestic mammals. In the majority of specimens a common pattern in the course and organization of the fibres could be observed. The most obvious features were the following: (1) a main circular fascicle surrounding the pulmonary trunks; (2) fibres encircling the atriovenous junctions; and (3) myocardial sleeves extending along the veins, occasionally as far as the lung. The superior part of the left atrial wall was consistently thicker than the inferior section. Individual variations of this wall between the various trunks followed one of four patternsvertical, oblique, horizontal or criss-crossed. Differences between mammal and human hearts were found regarding the number of pulmonary trunks, the presence of the oblique vein of the left atrium, and the extension of the myocardial sleeves on the caval vein. This extension on the caval vein continues over the end of the azygos vein in animals. The functional significance of the structures described in this study is discussed.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Morphology of atrial myocardial extensions into human caval veins: a postmortem study in patients with and without atrial fibrillation.

BACKGROUND Atrial fibrillation (AF) may be triggered from arrhythmogenic foci originating from atrial muscular sleeves that extend into the caval veins (CVs). The aim of this anatomic study was to evaluate both the extent and arrangement of atrial myocardial fibers in CVs in subjects with and without a history of AF. METHODS AND RESULTS Twenty-five human autopsied hearts (15 men; mean age, 65...

متن کامل

Targeting proteasome worsens atherosclerosis.

957 Letter to the Editor Nonbone Marrow–Derived Endothelial Progenitor Cells: What Is Their Exact Location? Alexandra Aicher, Stefanie Dimmeler, Christopher Heeschen Web Site Feature e102 On the cover: The image shows on the left the formation of the pulmonary myocardial sleeves by rapid proliferation of the just-differentiated myocardium (section of an E12.5 embryo stained for BrdU (red), cTnI...

متن کامل

Tissue structure and connexin expression of canine pulmonary veins.

OBJECTIVE Rapid electrical activity in pulmonary veins (PVs) has been proposed as a mechanism for focal atrial fibrillation. The way in which the myocardial sleeve inside PVs can form a substrate for focal activity is not well understood. Therefore, we have studied tissue structure and connexin distribution at the veno-atrial transition in the dog. METHODS In adult mongrel dogs, the anatomy o...

متن کامل

Morphofunctional study of the junction between the left atrium and the pulmonary veins in patient with pulmonary hypertension.

OBJECTIVE To study the arrangement of the myocardial fiber bundles at the pulmonary venous left atrial junction in patients with pulmonary hypertension, and to discuss the pathophysiological importance of this element in the etiology of acute pulmonary edema. METHODS We obtained 12 hearts and their pulmonary vein extremities from postmortem examinations of patients with the anatomicopathologi...

متن کامل

Basic and clinical electrophysiology of pulmonary vein ectopy.

In a subset of patients, atrial fibrillation is caused by rapidly firing foci that are often located in the pulmonary veins especially when fibrillation is paroxysmal. Histologic data show that myocardial tissue of the left atrial wall extends into the pulmonary venous walls. Both in dog and human pulmonary veins, arrangement of the myofibers is complex. Clinical and animal studies reveal both ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Thorax

دوره 25 3  شماره 

صفحات  -

تاریخ انتشار 1970