thebesian veins

small·est car·di·ac veins

[TA]
numerous small valveless venous channels that open directly into the chambers of the heart from the capillary bed in the cardiac wall, enabling a form of collateral circulation unique to the heart.

Thebesius,

Adam C., German physician, 1686-1732.
thebesian foramina - a number of fossae in the wall of the right atrium containing the openings of minute intramural veins. Synonym(s): foramina of the venae minimae
thebesian valve - a delicate fold of endocardium at the opening of the coronary sinus into the right atrium. Synonym(s): valve of coronary sinus
thebesian veins - numerous small valveless venous channels that open directly into the chambers of the heart from the capillary bed in the cardiac wall, enabling a form of collateral circulation unique to the heart. Synonym(s): venae cordis minimae
References in periodicals archive ?
Blood may return to the LV via the pulmonary circulation as a consequence of RV ejection or directly via the bronchial arteries and Thebesian veins. In most patients receiving VA ECMO, LV contractility is sufficient to prevent left heart distension.
The normal shunt fraction is between 0.025 and 0.050 as a result of the normal anatomic shunt that occurs because of the mixed-venous blood contributed to arterial blood by the bronchial, pleural, and Thebesian veins. The anatomic shunt accounts for the fact that the normal [SaO.sub.2] on room air ranges from 95% to 97.5%, as opposed to being 100% if the anatomic shunt were non-existent.