Description
The venous drainage of the superior aspect of the respiratory diaphragm arises from the superior phrenic, pericardiacophrenic, and musculophrenic veins. The inferior surface of the diaphragm is drained by the left and right inferior phrenic veins.
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Vein
A venous sinus is a vein with a thin wall of endothelium that is devoid of smooth muscle to regulate its diameter.
