small·est cardiac vein (smô l st)n. Any of the numerous small venous channels that open directly into the chambers of the heart from the capillary bed in the cardiac wall. |
smallest cardiac vein,
one of the tiny vessels that drain deoxygenated blood from the myocardium into the atria. A few of these vessels end in the ventricles. Also called vein of Thebesius. Compare anterior cardiac vein. See also coronary vein.
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