What does the sinus venarum do?
The sinus venosus collects venous blood (from the large bilateral ducti Cuvier, hepatic veins, anterior jugular veins, and the secondary circulation) and delivers it to the atrium.
What is cardiac sinus venarum?
The sinus venosus is a cardiac chamber upstream of the right atrium that harbours the dominant cardiac pacemaker. During human heart development, the sinus venosus becomes incorporated into the right atrium.
What opens into sinus venarum?
It is drained into by the: superior vena cava at its superiorly-sited orifice. inferior vena cava at its inferiorly-sited orifice. coronary sinus orifice anteroinferior to inferior vena caval orifice.
What is cardiac sinus?
The coronary sinus is a collection of smaller veins that merge together to form the sinus (or large vessel), which is located along the heart’s posterior (rear) surface between the left ventricle and left atrium.
What does the bulbus cordis become?
The bulbus cordis leads into the truncus arteriosus, which continues a short distance anteriorly before bifurcating into right and left branches, each of which extends anterolaterally and gives rise to three large arteries (Figures 6.15 and 6.17).
What does the primitive atrium become?
The primitive atrium becomes the anterior portions of both the right and left atria, and the two auricles. The sinus venosus develops into the posterior portion of the right atrium, the SA node, and the coronary sinus.
What is superior node?
The sinoatrial node (SAN) is the natural pacemaker of the heart that determines heart rate in mammals, including humans. It is characterized by the ability to generate spontaneous action potentials that serve to excite the surrounding atrial myocardium.
What does the SA node stimulate?
SA node: The SA node (SA stands for sinoatrial) is one of the major elements in the cardiac conduction system, the system that controls the heart rate. This stunningly designed system generates electrical impulses and conducts them throughout the muscle of the heart, stimulating the heart to contract and pump blood.
How serious is Tachy-Brady syndrome?
Tachy-Brady Syndrome In this situation, the heart may beat too quickly (tachycardia), then too slowly (bradycardia). Complications can include loss of consciousness and ultimately a higher risk of stroke.
Is sinus arrhythmia serious?
Sinus arrhythmia is a common, harmless condition that is not necessarily dangerous; however, it should be evaluated if accompanied by other signs of heart problems. Sinus arrhythmia is a variation in normal sinus rhythm.
What does the bulbus arteriosus become?
The bulbus cordis develops into the right ventricle, whereas the primitive ventricle becomes the left ventricle.
What is Bulboventricular flange?
Externally the interventricular sulcus separates the right and left ventricles and internally they are separated by the bulboventricular flange. Remember that the right ventricle arises from the proximal bulbus cordis. AVC = Atrioventricular canal. BC = Bulbus Cordis. BVF = Bulboventricular flange.