From the inflow to the outflow, it consists of sinus venosus, primitive atrium, the primitive ventricle, the bulbus cordis, and truncus arteriosus.
12.
In these animals, the muscles of the heart are relatively continuous and the sinus venosus coordinates the beat which passes in a wave through the remaining chambers.
13.
Similarly, while the sinus venosus is present as a vestigial structure in some reptiles and birds, it is otherwise absorbed into the right atrium and is no longer distinguishable.
14.
In the embryo, the thin walls of the sinus venosus are connected below with the right ventricle, and medially with the left atrium, but are free in the rest of their extent.
15.
The developing tubular heart then folds ventrally and bulges in five regions along its length : the first one and closest to the arterial end is the truncus arteriosus, then follow the bulbus cordis, the primitive ventricle, the primitive atrium and the sinus venosus.
16.
The first chamber is the sinus venosus, which collects deoxygenated blood, from the body, through the dorsal aorta, into the rest of the body . ( In tetrapods, the ventral aorta has divided in two; one half forms the ascending aorta, while the other forms the pulmonary artery ).
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