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auricles
Musculi Pectinati terminate at the Crista Terminalis in the Right Atrium. Musculi Pectinati can also be found in the Left Atrium.
Pectinate muscles
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The heart is divided into four chambers, with a wall in between each one.
Right Atrium chamber wall.
the cardiac wall is the prevent to rigth atrium
strong then the right atrium but not as strong as the left ventricle because the left atrium deals with a higher pressure in comparison to the right atrium. The walls of the posterior left atrium are smooth, this part receives the 4 pulmonary veins The wall of the anterior left atrium contain musculi pectinati, small ridges in the wall Unlike in the right atrium there is no definitive division between the two
One separating the atrium and ventricle is called atrial septum and ventricular septum respectively.
The interatrial septum separates the left and right atria.
Bundle of His .
The natural pacemaker of the heart is called the sinus node. This is made up of a cluster of cells that are in the upper right part of the wall of the right atrium.