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Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Peter Merrifield

Anatomy NotesFeb 712 Coronary circulation involves blood vessels that service the heart The heart has its own blood supply If an artery in the coronary circulation gets blocked it can lead to a heart attack The blood vessels that carry blood to and from the lungs form the pulmonary circuit The vessels that transport blood to and from all body tissues form the systemic circuit The right side of the heart pumps blood through the pulmonary circuit and the left side pumps blood through the systemic circuit Anatomy of the heart Internally the heart chambers are divided longitudinally by the interatrial septum or the interventricular septum Externally the coronary sulcus separates the atria and ventricles The anterior interventricular sulcus and posterior interventricular sulcus separate the ventricles The right atrium receives deoxygenated blood from the superior vena cava blood from brain and upper limbs inferior vena cava blood from abdomen and lower limbs and coronary sinus The right auricle is a small flap that projects anteriorly from the superior corner of the atrium Internally the posterior wall is smooth called sinus venarum and the anterior wall has pectinate muscles These two smooth and rough parts of the atrium are separated by a Cshaped ridge called the crista terminalis The superior vena cava opens into the atrium just posterior to the superior bend of the crista the inferior vena cava opens into the atrium just posterior to the inferior bend of the crista and the coronary sinus empties deoxygenated blood from coronary circulation into the atrium near the medial edge of the crista Posterior to the end of the crista is the fossa ovalis The RA opens into the RV through the tricuspid valve right atrioventricular valve which has three leaflets The right ventricle receives blood from the RA and pumps it into the pulmonary circuit via an artery called the pulmonary trunk The walls of the RV have ridges of muscles called trabeculae carneae Papillary muscles project from the walls and chordae tendineae project superiorly from the pap
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