| | V. Angiology. 4b. The Heart. Gray, Henry. 1918. Anatomy of the Human Body. (Site not responding. Last check: 2007-10-20) |
 | | It returns blood from the substance of the heart and is protected by a semicircular valve, the valve of the coronary sinus (valve of Thebesius). |
| | The foramina venarum minimarum (foramina Thebesii) are the orifices of minute veins (venœ cordis minimœ), which return blood directly from the muscular substance of the heart. |
| | The atrioventricular opening (tricuspid orifice) is the large oval aperture of communication between the atrium and the ventricle; it will be described with the right ventricle. |
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