Septum spurium

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Septum spurium
Interior of dorsal half of heart from a human embryo of about thirty days. (Septum spurium labeled at upper left.)
Interior of dorsal half of heart of human embryo of about thirty-five days. (Septum spurium labeled at upper left.)
Gray's subject #135 510
Dorlands/Elsevier s_08/12730628

During development of the heart, the orifice of the coronary sinus lies obliquely, and is guarded by two halves, the right and left venous valves; above the opening these unite with each other and are continuous with a fold named the septum spurium.

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