Skip to main content

Unfortunately we don't fully support your browser. If you have the option to, please upgrade to a newer version or use Mozilla Firefox, Microsoft Edge, Google Chrome, or Safari 14 or newer. If you are unable to, and need support, please send us your feedback.

Elsevier
Publish with us
Fibrous Skeleton of Heart
Cardiovascular System

Fibrous Skeleton of Heart

Skeleton fibrosum cordis

Read more

Morphology/Structure

The structure of the heart and muscular fibers are set around a fibrous cardiac skeleton consisting of dense connective tissue. The bulk of the fibrous skeleton consists of four fibrous rings that surround the orifices of the valves. These are:

- the right fibrous ring, which sits around the right atrioventricular valve;

- the left fibrous ring, which sits around the left atrioventricular valve;

- the aortic fibrous ring, which sits around the aortic valve;

- the pulmonary fibrous ring, which sits around the pulmonary valve.

Complete Anatomy
The world's most advanced 3D anatomy platform
Try it for Free

Key Features/Anatomical Relations

The right fibrous ring is connected to the aortic ring by a roughly triangular mass of fibrous tissue called the right fibrous trigone. Likewise, the left fibrous ring is connected to the aortic ring by the left fibrous trigone. These fibrous trigones form the strongest portions of the fibrous skeleton. The rings are also connected to the membranous part of the upper interventricular septum.

Function

The collagenous properties of the fibrous rings separate the atria from the ventricles. This helps to separate the electrical activities between the chambers by insulating the propagation of electrical impulses during a heartbeat. The region where the atrioventricular bundle passes from the atrioventricular node to the ventricles does not contain collagen and permits the propagation of electrical impulses. It also provides a direct attachment for cardiac muscle and the membranous interventricular septum.

Learn more about this topic from other Elsevier products

Cardiac Skeleton

ScienceDirect image

The cardiac skeleton consists of four rings of dense connective tissue that surround the AV canals (mitral and tricuspid) and extend to the origins of the aorta and the pulmonary trunk, providing structure and support for the heart as well as electrical isolation between the atria and the ventricles.

Explore on ScienceDirect(opens in new tab/window)

Complete Anatomy

The world's most advanced 3D anatomy platform

Complete Anatomy