trabecula carnea

anatomy

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Last updated

July 14, 2026

Quick Summary

The trabeculae carneae are muscular ridges lining the inner surfaces of the ventricles, the lower chambers of the heart. These structures are composed of bundles and bands of muscle. Within the ventricles, papillary muscles project from the ventricular walls and attach to the valves between the atria and ventricles via tendon strands. Their function is to prevent these valves from opening when the ventricles contract, ensuring blood is pumped forward. The walls of the ventricles, especially the left ventricle, are heavily muscled to generate the force needed to pump blood to the body and lungs.12

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ventricle
…and bands of muscle, called trabeculae carneae. The papillary muscles project like nipples into the cavities of the ventricles. They are attached by fine strands of tendon to the valves between the atria and ventricles and prevent the valves from opening when the ventricles contract. .
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…and bands of muscle, called trabeculae carneae. The papillary muscles project like nipples into the cavities of the ventricles. They are attached by fine strands of tendon to the valves between the atria and ventricles and prevent the valves from opening when the ventricles contract. .
Read More