myocardium is a thick contractile middle layer of uniquely - TopicsExpress

myocardium is a thick contractile middle layer of uniquely constructed and arranged muscle cells that forms the bulk of the heart wall. It contains a minimum of other tissue, except blood vessels, and is covered interiorly by the endocardium. The contractile tissue of the myocardium is composed of fibers with the characteristic cross-striations of muscular tissue. The fibers are about one third as large in diameter as those of skeletal muscle and contain more sarcoplasm. They branch frequently and are interconnected to form a network that is continuous except where the bundles and the laminae are attached at their origins and insertions into the fibrous trigone of the heart. The conducting system of the heart is formed of specially modified fibers of myocardial muscle, including the sinoatrial node, the atrioventricular (AV) node, the AV bundle, and the Purkinje fibers. youtu.be/UMTDmP81mG4 #anatomy #thorax

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