👉 The term "ectocardia" refers to a type of cardiac tissue that is found in the left ventricle. It consists of two main structures - the superior and inferior vena cavae (SVs) - which are located within the left atrium, but they exit through the right ventricle. The ectocardial tissue is composed primarily of elastic fibers called myocytes, which are responsible for the contraction and relaxation of the heart muscle.