| Front | Atrioventricular bundle |
|---|---|
| Back | (AV, of His) Structure: a tract of specialized cardiac muscle fibers adapted for conducting electrical impulses (Purkinje fibers). a) arises from AV node in interatrial wall b) pierces the heart's fibrous skeleton and passes through the membranous part of the interventricular septum. c) divides into right and left AV bundle branches that descend down the interventricular suptum towards the apex (right bundle passes through moderator band) Function: 1. Transmits depolarization signal down branches without innervating myocardium (branches are insulated) 2. Purkinje fibers innervate apices of ventricles, allowing contraction to begin at apices and spread superiorly (pumping blood up towards pulmonary and aortic valves) |
Tags: cardiovascular
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