APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The SA node starts the sequence by causing the atrial muscles to contract. That’s why doctors sometimes call it the anatomical pacemaker. Next, the signal travels to the AV node, through the bundle of HIS, down the bundle branches, and through the Purkinje fibers, causing the ventricles to contract.

Detailed explanation-2: -Your Purkinje fibers are in the subendocardial surface of your ventricle walls. The subendocardial surface is part of the endocardium, the inner layer of tissue that lines your heart’s chambers. When the Purkinje fibers deliver electrical signals to your ventricles, the ventricles contract.

Detailed explanation-3: -Innervation of the AV node, His bundle, and ventricular myocardium. The AV node and His bundle are innervated by a rich supply of cholinergic and adrenergic fibers with higher densities as compared with the ventricular myocardium.

Detailed explanation-4: -Purkinje fibers play a major role in electrical conduction and propagation of impulse to the ventricular muscle. Many ventricular arrhythmias are initiated in the Purkinje fiber conduction system (eg.