What is the function of the interventricular septum in the heart?
The interventricular septum separates the ventricles and allows for proper blood flow through the heart: from the right atrium through the tricuspid valve to the right ventricle to the lungs, back to the left atrium, followed by the left ventricle through the mitral valve.
What does the interventricular septum contract?
The interventricular septum is quite dynamic during each cardiac cycle. It contracts with the ventricles during systole such that it shortens longitudinally (from the base to the apex) and becomes thicker.
What is the difference between the interventricular and septum?
That portion of the septum that separates the two upper chambers (the right and left atria) of the heart is termed the atrial (or interatrial) septum while the portion of the septum that lies between the two lower chambers (the right and left ventricles) of the heart is called the ventricular (or interventricular) …
What are the interatrial and interventricular septa?
cardiovascular system. …a partition known as the interatrial septum; the lower chambers, the ventricles, are separated by the interventricular septum. The atria receive blood from various parts of the body and pass it into the ventricles. The ventricles, in turn, pump blood to the lungs and to the remainder of the body …
What supplies the interventricular septum?
The posterior interventricular artery, a branch of right coronary artery, supplies the posterior 1/3 of the interventricular septum. The remaining anterior 2/3 is supplied by the anterior interventricular artery which is a septal branch of the left anterior descending artery, which is a branch of left coronary artery.
Where does the interventricular septum receives blood from?
The cephalic part of the posterior one-third of the septum gets its blood supply from the posterior interventricular artery; some variations in this arrangement have been encountered.
What is the blood supply to the interatrial and interventricular septum where the delicate conduction system is located?
AVN artery
AVN artery The artery provides branches to the posterior interventricular septum, interatrial septum, AVN, and penetrating bundle of His [18]. In some patients, at the level of the Koch triangle, the AVN artery courses just beneath the endocardium near the ostium of the coronary sinus and the septal isthmus (Figure 7).
How does the interventricular septum form?
The muscular part of the interventricular septum derives from the bulboventricular flange which is developed due to differential growth of primitive ventricle and bulbous cordis.
What does the interventricular septum divide?
The interventricular septum divides the right and left ventricles, running in the plane of the anterior and posterior interventicular grooves. Septation of the ventricles occurs in the fetus within 7 weeks of gestation, achieved by the formation of this embryologically heterogenous structure 6.
Is the interatrial septum muscular or fibrous?
This thick, muscular structure initially takes on the same crescent shape as the septum primum, except that it originates anteriorly, whereas the septum primum originates posteriorly. As the septum secundum grows, it leaves a small opening called the foramen ovale.
What is membranous part of interventricular septum?
The membranous portion of the interventricular septum (MPIS) has been described as a small, oval portion of the cardiac septum that lies immediately below the aortic valve. Its location and relationship with the aortic valve are very important in surgical interventions.
What supplies blood the the interventricular septum?
What is intraventricular conduction delay?
Intraventricular conduction delay (defect): constellations of bundle branch blocks and fascicular blocks (hemiblocks) In this chapter we will discuss intraventricular conduction delays (defects), which are caused by functional or anatomical defects in the components of the intraventricular conduction system.
What is the intraventricular conduction system composed of?
The intraventricular conduction system is composed of the His-Purkinje system. More precisely this system consists of the bundle of His, the left and right bundle branch and the fascicles of the left bundle branch ( Figure 1 ).
What is the difference between left and right ventricle conduction defects?
In general, a conduction defect in the left ventricle is more significant, as compared with a defect affecting the right ventricle. This is due to the fact that the left ventricle pumps against greater resistance and any disturbance in ventricular activation will reduce the efficiency of the pumping function.
Where are the conduction defects located in the heart?
The current chapters discuss conduction defects located in the bundle branches and in the fascicles. Figure 1. Components of the ventricular conduction system and the temporal association between the ECG and impulse transmission through the heart.