Bassett Collection of Stereoscopic Images of Human Anatomy
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Dissection of pericardium and heart in situ
Interatrial cleavage plane
Image #118-1
KEYWORDS: Heart, Pericardial sac, Right heart.
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Stanford holds the copyright to the David L. Bassett anatomical images and has assigned Creative Commons license Attribution-Share Alike 4.0 International to all of the images.
For additional information regarding use and permissions, please contact Dr. Drew Bourn at dbourn@stanford.edu.
Dissection of pericardium and heart in situ
Interatrial cleavage plane
An incision has been made in the epicardium (6) bordering the right atrium. The superior vena cava and upper part of the right atrium have been reflected anteriorly and to the left to display the plane of cleavage between the myocardial layers of the right and left atria. In the upper part of the area of contact of the atria there is no interconnection of the two myocardial layers. In the lower part (9), which overlies the point of entrance of the lower right pulmonary vein into the left atrium, there is considerable interweaving of muscle fibers of the two atria. The proximity of this cleavage plane to the fossa ovalis can be readily visualized, although the fossa ovalis is partially obscured in this view.
- Azygos vein (divided)
- Right main bronchus
- Tracheobronchial lymph node
- Cardiac plexus
- Right pulmonary artery
- Incision in epicardium to display interatrial cleavage plane
- Myocardium of left atrium (overlying upper right pulmonary vein)
- Nerve filament of cardiac plexus
- Area of intermingling atrial muscle fasciculi
- Sino-atrial node
- Fossa ovalis
- Wall of right atrium
- Pericardium
- Right phrenic nerve
- Ascending aorta
- Superior vena cava (retracted)
- Left coronary artery
- Latex cast within left ventricle
- Interventricular septum
- Border of fossa ovalis
- Right ventricle
- Latex cast within inferior vena cava