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The anterior interventricular sulcus (or anterior longitudinal sulcus) is one of two grooves separating the ventricles of the heart (the other being the posterior interventricular sulcus).
The interatrial septum separates the atria, and the interventricular septum separates the ventricles. [8] The interventricular septum is much thicker than the interatrial septum since the ventricles need to generate greater pressure when they contract.
The interatrial septum is a septum that lies between the left atrium and right atrium of the human heart. The interatrial septum lies at angle of 65 degrees from right posterior to left anterior because right atrium is located at the right side of the body while left atrium is located at the left side of the body. [1]
Occasionally, the eustachian valve crosses the floor of the right atrium from the orifice of the IVC and inserts into the lower portion of the interatrial septum adjacent to the atrioventricular valves. [2] However, higher insertion of a giant eustachian valve, which mimics the echocardiographic appearance of divided right atrium, is very rare.
The septum primum is on the left side of the heart in the left atrium while the septum secundum is much thicker and is located on the right side, in the right atrium. During development, blood shunts from the floor of the right atrium through the foramen ovale in the septum secundum then up through the foramen secundum in the septum primum. [2]
The interatrial septum has an opening in the right atrium, the foramen ovale, which provides access to the left atrium; this connects the two chambers, which is essential for fetal blood circulation. At birth, when the first breath is taken fetal blood flow is reversed to travel through the lungs.
The tendon of Todaro is a continuation of the Eustachian valve of the inferior vena cava and the valve of the coronary sinus.Along with the opening of the coronary sinus and the septal cusp of the tricuspid valve, Koch's triangle is made up.
The AV node lies at the lower back section of the interatrial septum near the opening of the coronary sinus, which conducts the normal electrical impulse from the atria to the ventricles. The AV node is quite compact (~1 x 3 x 5 mm). [ 2 ]