Myocardium

Myocardium, also known as cardiac muscle, is the musclar component of the heart found in the walls of the ventricles, atria and intraventricular septum. It consists of involuntary striated muscle cells that are uninucleate and are attatched to eachother by specialized junctions known as intercalated dics. Although cardiac muscle fibers are striated, they differ from skeletal muscle cells because they are much smaller and are not multinucleate. The intercalated dics are composed of two important components, desmosomes and gap juntions. Desmosomes are strong connections that hold neighbouring cells together. Gap junctions are related to electrical signals in the heart and allow depolarisation to spread rapidly from cell to cell.