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Related to pericardial sac: Pleural sac


see heartheart,
muscular organ that pumps blood to all parts of the body. The rhythmic beating of the heart is a ceaseless activity, lasting from before birth to the end of life. Anatomy and Function

The human heart is a pear-shaped structure about the size of a fist.
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the closed, saclike structure surrounding the heart in vertebrate animals and in man. The pericardium is an isolated part of the secondary body cavity, the coelom. It consists of two layers: an external, parietal layer—the pericardium proper—and an internal, visceral layer—the epicardium. The pericardium proper consists, in turn, of an internal, serous layer and an external, fibrous layer. The epicardium, being an external membrane of the heart, directly covers and is fused to the heart muscle (myocardium). In the region where large blood vessels enter and leave the heart, the epicardium is turned back and is continuous with the pericardium proper. Between the pericardium layers is a slitlike cavity containing a small quantity of transparent pale-yellow serous fluid. The pericardium contains blood vessels, lymphatics, and numerous nerve endings and is surrounded by areolar connective tissue. It has many receptors, whose stimulation causes hemodynamic and respiratory changes.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


The membranous sac that envelops the heart; it contains 5-20 grams of clear serous fluid.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


the membranous sac enclosing the heart
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Take care to extract one of the paired buccal ganglia immediately posterior to the buccal mass and the visceral ganglion on the wall of the esophageal groove close to the pericardial sac. Ganglia can also be sampled by transecting a 1-[cm.sup.3] portion of the surrounding columellar muscle.
In Group 2, after the end of 60-min tamponade the blood was released from the pericardial sac and the animals were monitored for 180 min.
However, in pneumopericardium, serial chest X-rays in left lateral decubitus position show air movement in the pericardial sac between two films while the air column remains stable in pneumomediastinum [5, 15].
Repeat pericardiocentesis was not performed because of the small amount of fluid present and the presence of structures between the pericardial sac and the body wall.
An incision was made over the costal cartilage of the 6th rib and after opening up the pericardial sac the fluid was allowed to drain into the pleural space.
Cardiac tamponade is defined as "the progressive accumulation of blood in the pericardial sac" (Urden, Stacy, & Lough, 2006, p.
An inch-long tear in the right ventricle was spilling blood into the heart's pericardial sac, causing Amos' heart to stop.
Jamia was transferred to the neonatal intensive care unit at the Medical University of South Carolina (MUSC) where it was determined the wall of the right atrium was periforated, allowing blood and intravenous fluid to fill the pericardial sac around the heart, effectively causing tamponade.
Jamia was transferred to the neo-natal intensive care unit at Medical University of South Carolina (MUSC) where it was determined the wall of the right atrium was perforated allowing blood and intravenous fluid to fill the pericardial sac around the heart, effectively causing tamponade.
They shared a liver and a pericardial sac, the membrane which surrounds the heart.
However, on March 14, 2006, Corautus announced that Boston Scientific had requested a voluntary suspension of the trial as a result of several serious adverse events ("SAEs") of pericardial effusion (excess fluid in the pericardial sac), which did not appear to be related to the angiogenic gene (VEGF-2).