Question

what is sinus venosus and truncus atriosus?​

Answer 1

Anatomical terminology. The sinus venosus is a large quadrangular cavity which precedes the atrium on the venous side of the chordate heart. In mammals, it exists distinctly only in the embryonic heart (where it is found between the two venae cavae); however, the sinus venosus persists in the adult.

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