base | apex | grooves (coronary/atrioventricular, interatrial, anterior interventricula, posterior interventricular) | surfaces (sternocostal, diaphragmatic) | borders (right, left) The circulatory system or cardiovascular system is the organ system which circulates blood around the body of most animals. ... The heart and lungs, from an older edition of Grays Anatomy. ... In anatomy, the atrium (plural: atria) is the blood collection chamber of a heart. ... The interatrial septum is the wall of tissue that separates the right and left atria of the heart. ... In the heart, a ventricle is a heart chamber which collects blood from an atrium (another heart chamber that is smaller than ventricle) and pumps it out of the heart. ... Grays Fig. ... Structure of the Chordae Tendineae Valves like the Tricuspid valve and the Semilunar valves in the heart are attached to the walls of the heart by cord-like tendons called chordae tendineae. ... In anatomy, the papillary muscles of the heart serve to limit the movements of the mitral and tricuspid valves and prevent them from being everted. ... Grays Fig. ... The base of the heart, directed upward, backward, and to the right, is separated from the fifth, sixth, seventh, and eighth thoracic vertebræ by the esophagus, aorta, and thoracic duct. ... Apex of the Heart: it is the most outer superficial part of the heart which is situated on the left 5th intercostal space. ... The ventricles of the heart are separated by two grooves, one of which, the anterior longitudinal sulcus (or anterior interventricular sulcus), is situated on the sternocostal surface of the heart, close to its left margin. ... The sternocostal surface of the heart (anterior surface of the heart) is directed forward, upward, and to the left. ...

right heart: (vena cavae, coronary sinus) → right atrium (auricle, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve of the inferior vena cava, valve of the coronary sinus) → tricuspid valve → right ventricle (conus arteriosus, moderator band/septomarginal trabecula)  → pulmonic valve  → (pulmonary artery and pulmonary circulation) Right heart is a term used to refer collectively to the right atrium and right ventricle of the heart. ... The superior and inferior venae cavae are the veins that return the blood from the body into the heart. ... An aortic sinus is one of the anatomic dilations of the ascending aorta which occurs at the aortic root, i. ... This page is about the muscular organ, the Heart. ... In anatomy, the heart valves are valves in the heart that prevent blood from flowing the wrong way. ... The right ventricle is one of four chambers (two atria and two ventricles) in the human heart. ... In anatomy, the heart valves are valves in the heart that prevent blood from flowing the wrong way. ... The pulmonary arteries carry blood from the heart to the lungs. ... Pulmonary circulation is the portion of the cardiovascular system which carries oxygen-depleted blood away from the heart, to the lungs, and returns oxygenated blood back to the heart. ...

left heart: (pulmonary veins) → left atrium (auricle) → mitral valve → left ventricle → aortic valve (aortic sinus) → (aorta and systemic circulation) Left heart is a term used to refer collectively to the left atrium and left ventricle of the heart. ... The pulmonary veins carry blood from the lungs to the left atrium of the heart. ... This page is about the muscular organ, the Heart. ... The mitral valve, also known as the bicuspid valve, is a valve in the heart that lies between the left atrium (LA) and the left ventricle (LV). ... In the heart, a ventricle is a chamber which collects blood from an atrium (another heart chamber) and pumps it out of the heart. ... The aortic valve is one of the valves of the heart. ... An aortic sinus is one of the anatomic dilations of the ascending aorta which occurs at the aortic root, i. ... The largest artery in the human body, the aorta originates from the left ventricle of the heart and brings oxygenated blood to all parts of the body in the systemic circulation. ... Systemic circulation is the portion of the cardiovascular system which carries oxygenated blood away from the heart, to the body, and returns oxygen-depleted blood back to the heart. ...

pericardium  (sinus) | epicardium | endocardium | myocardium | cardiac skeleton (fibrous trigone, fibrous rings) The pericardium is a double-walled sac that contains the heart and the roots of the great vessels. ... Epicardium describes the outer layer of heart tissue (from Greek; epi- outer, cardium heart). ... In the heart, the endocardium is the innermost layer of cells, embryologically and biologically similar to the endothelium that lines blood vessels. ... Myocardium is the muscular tissue of the heart. ... Cardiac skeleton (sometimes called fibrous skeleton of the heart) refers to the structure of connective tissue in the heart that separates the atria from the ventricles. ...

conduction system: cardiac pacemaker | Purkinje fibers | bundle of His | SA node | AV node The normal electrical conduction in the heart allows the impulse that is generated by the sinoatrial node (SA node) of the heart to be propagated to (and stimulate) the myocardium (muscle of the heart). ... The contractions of the heart are controlled by electrical impulses, these fire at a rate which controls the beat of the heart. ... Purkinje fibers (or Purkyne tissue) are located in the inner ventricular walls of the heart, just beneath the endocardium. ... Heart cut away showing Bundle of His Schematic representation of the atrioventricular bundle of His. ... The sinoatrial node (abbreviated SA node, also called the sinus node) is the impulse generating (pacemaker) tissue located in the right atrium of the heart. ... The atrioventricular node (abbreviated AV node) is the tissue between the atria and the ventricles of the heart, which conducts the normal electrical impulse from the atria to the ventricles. ...