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CHAPTER 9 - CARDIOVASCULAR SYSTEM
Histology Guide
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FIGURE

NAME
Fig 019 Cardiac Valves and Skeleton
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T. Clark Brelje
Jean Magney
University of Minnesota
Minneapolis, MN

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University of Minnesota
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Robert L. Sorenson, Ph.D.

University of Minnesota
Department of Genetics, Cell Biology and Development
6-160 Jackson Hall
321 Church St SE
Minneapolis, MN 55455

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Fig 019 Cardiac Valves and Skeleton

Heart valves are folds of the endocardium that are anchored to the cardiac skeleton, also known as the fibrous skeleton of the heart.

Heart Valves

Heart values are composed of multiple leaflets that are thin folds of the endocardium.

  • Endothelium covers both external surfaces
  • Dense connective tissue forms the core of the leaflet (collagen and elastic fibers)
  • Avascular - nutrients supplied by diffusion

The fibrous core of leaflets is continuous with the fibrous rings of the cardiac skeleton.

Cardiac Skeleton

The cardiac skeleton is composed of four fibrous rings of dense irregular connective tissue.

  • Attachment site for the leaflets of the heart values
  • Attachment site of atrial and ventricular myocardium
  • Insulates electrically the atria above the fibrous skeleton from the ventricles below

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