A small mass of specialized muscle on the back wall of the right atrium, also known as the pacemaker, is medically known as what?

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The small mass of specialized muscle on the back wall of the right atrium, also known as the pacemaker, is medically known as the sinoatrial node (S-A node). The atrioventricular node (A-V node) is located on the floor of the right atrium and is responsible for delaying the transmission of electrical impulses from the atria to the ventricles. The bundle of His is a bundle of specialized muscle fibers that conducts the electrical impulses from the A-V node to the ventricles. The cardiopulmonary node is not a medically recognized term.

A Small Mass of Specialized Muscle on the Back Wall