APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The sinoatrial node (SAN) is also known as the sinus node, is a group of cells located in the wall of the right atrium of the heart.

Detailed explanation-2: -The sinus node is sometimes called the heart’s “natural pacemaker.” Each time the sinus node generates a new electrical impulse; that impulse spreads out through the heart’s upper chambers, called the right atrium and the left atrium (figure 2).

Detailed explanation-3: -The cells of the AV node are specialized cardiac muscle cells (cardiomyocytes), also known as nodal cardiac muscle cells, which are smaller than typical cardiomyocytes and lack intercalated discs.