<Tr> <Th> FMA </Th> <Td> 14068 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> Cardiac muscle (heart muscle) is an involuntary, striated muscle that is found in the walls and histological foundation of the heart, specifically the myocardium . Cardiac muscle is one of three major types of muscle, the others being skeletal and smooth muscle . These three types of muscle all form in the process of myogenesis . The cells that constitute cardiac muscle, called cardiomyocytes or myocardiocytes, predominantly contain only one nucleus, although populations with two to four nuclei do exist . The myocardium is the muscle tissue of the heart, and forms a thick middle layer between the outer epicardium layer and the inner endocardium layer . </P> <P> Coordinated contractions of cardiac muscle cells in the heart pump blood out of the atria and ventricles to the blood vessels of the left / body / systemic and right / lungs / pulmonary circulatory systems . This complex mechanism illustrates systole of the heart . </P>

Where is cardiac muscle tissue located in the body