ANAT 215 Lecture Notes - Lecture 31: Left Coronary Artery, Interventricular Septum, Right Coronary Artery
Document Summary
Hepatic veins drain the liver and return blood to the systemic circulation: mediastinum holds the heart and surrounding structures. 300 g: l = 12 cm; w = 9 cm, it sits at an angle [left rotate], it is posterior to sternum, anterior to spine & esophagus, interatrial septum [not shown] is between the two atria. Interventricular septum is between the two ventricles: atriaventricular groove [coronary sulcus] separates the atria from the ventricles. The interventricular groove separates the ventricles: each semilunar valve has three sac- like flaps and no chordate tendinae. When ventricles contract, the flaps open and block the coronary arteries. When ventricles relax, some blood back-flows and fills the flaps, shutting the valves closed: coronary circulation is the shortest in the body. In anterior view, the small cardiac vein is on the left, and the great cardiac vein is on the right: myocardiocytes [cardiac muscle], fibrous bundles [dense irr.