sinus venosus การใช้

• The sinus venosus connects to the fetal circulation.
• A sinus venosus ASD that involves the superior vena cava makes up 2 to 3 % of all interatrial communication.
• In teleosts, with their vestigial sinus venosus, the main centre of coordination is, instead, in the atrium.
• Pacemaker cells develop in the primitive atrium and the sinus venosus to form the sinoatrial node and the atrioventricular node respectively.
• Individuals with a sinus venosus ASD exhibit a left axis deviation of the P wave ( not the QRS complex ).
• The vessels draining the plexus into the sinus venosus are termed the venae revehentes, and form the future hepatic veins.
• Ultimately the left vena revehens no longer communicates directly with the sinus venosus, but opens into the right vena revehens.
• Indeed, since the sinus venosus is incorporated into the right atrium in amniotes, it is likely homologous with the SA node.
• The tubular heart quickly differentiates into the truncus arteriosus, bulbus cordis, primitive ventricle, primitive atrium, and the sinus venosus.
• The human venous system develops mainly from the vitelline veins, the umbilical veins and the cardinal veins, all of which empty into the sinus venosus.
• From the inflow to the outflow, it consists of sinus venosus, primitive atrium, the primitive ventricle, the bulbus cordis, and truncus arteriosus.
• 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.
• 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.
• 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.
• 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.
• 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 ).