Pericardial sac
The pericardial sac is a conical sac of fibrous tissue which surrounds the heart and the roots of the great blood vessels. The pericardium has outer and inner coats. The outer coat is tough and thickened, loosely cloaks the heart, and is attached to the central part of the diaphragm and the back of the sternum (breastbone). The inner coat is double with one layer closely adherent to the heart while the other lines the inner surface of the outer coat with the intervening space being filled with fluid. This small amount of fluid, the pericardial fluid, acts as a lubricant to allow normal heart movement within the chest. The word "pericardium" means around the heart. The outer layer of the pericardium is called the parietal pericardium. The inner part of the pericardium that closely envelops the heart is called the visceral pericardium or epicardium.

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pericardium.

Medical dictionary. 2011.

Look at other dictionaries:

  • pericardial sac — noun the membrane surrounding the heart • Hypernyms: ↑sac …   Useful english dictionary

  • pericardial sac — parietal pericardium …   Dictionary of ichthyology

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  • Pericardial effusion — Too much fluid within the fibrous sac (the pericardium) that surrounds the heart. The inner surface of the pericardium is lined by a layer of flat cells (mesothelial cells). The pericardial sac normally contains a small amount of fluid which acts …   Medical dictionary

  • Sac, pericardial — The pericardial sac is a conical sac of fibrous tissue which surrounds the heart and the roots of the great blood vessels. The pericardium has outer and inner coats. The outer coat is tough and thickened, loosely cloaks the heart, and is attached …   Medical dictionary

  • Pericardial — Referring to the pericardium, the sac of fibrous tissue that surrounds the heart. The inner surface of the pericardium is lined by a layer of flat cells (mesothelial cells). The pericardial sac normally contains a small amount of fluid which acts …   Medical dictionary

  • pericardial sinus — Space, bounded ventrally by a pericardial membrane, within which the heart lies [Holdich and Jones, 1983]. (Order Anostraca): In circulatory system, elongate cavity surrounding heart. Blood collects within sinus and enters heart through ostia;… …   Crustacea glossary

  • Pericardial fluid — is secreted by the serous membrane on the pericardious sac on the outside of the heart. The pericardial cavity contains between 15 and 50ml of pericardial fluid. It is similar to the serous fluid that is found in the brain for cushioning and… …   Wikipedia

  • Pericardial friction rub — A pericardial friction rub, also pericardial rub, is an audible medical sign used in the diagnosis of pericarditis. Upon auscultation, this sign is an extra heart sound of to and fro character, typically with three components, one systolic and… …   Wikipedia

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