Cardiac skeleton
Cardiac Skeleton
The Cardiac Skeleton (pronunciation: /ˈkɑːrdiæk ˈskɛlɪtən/), also known as the skeleton of the heart, is a fibrous structure in the heart that separates the atria from the ventricles. It consists of four bands of dense connective tissue in the shape of rings that surround the bases of the pulmonary trunk, aorta, and atrioventricular valves.
Etymology
The term "Cardiac Skeleton" is derived from the Greek words "kardia" meaning heart and "skeletos" meaning dried up. This term is used to describe the structure that provides the rigid support for the heart valves and the points of attachment for the myocardial fibres.
Structure
The Cardiac Skeleton is composed of four parts: two Atrioventricular rings, the Aortic ring, and the Pulmonary ring. These rings provide the framework for the attachment of the heart valves and the myocardium. They also act as electrical insulators, preventing the direct spread of electrical impulses from the atria to the ventricles.
Function
The primary function of the Cardiac Skeleton is to provide structural support to the heart. It maintains the shape of the heart and ensures the proper functioning of the heart valves. Additionally, it plays a crucial role in the heart's electrical system by preventing the direct spread of electrical impulses from the atria to the ventricles, thus ensuring the coordinated contraction of the heart chambers.
Related Terms
- Atrioventricular rings: These are fibrous rings that surround the atrioventricular orifices of the heart. They provide the framework for the attachment of the atrioventricular valves.
- Aortic ring: This is a fibrous ring that surrounds the base of the aorta. It provides the framework for the attachment of the aortic valve.
- Pulmonary ring: This is a fibrous ring that surrounds the base of the pulmonary trunk. It provides the framework for the attachment of the pulmonary valve.
- Myocardium: This is the muscular tissue of the heart. It contracts to pump blood out of the heart and then relaxes as the heart refills with returning blood.
External links
- Medical encyclopedia article on Cardiac skeleton
- Wikipedia's article - Cardiac skeleton
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