Borders of heart

• "Taber's Cyclopedic Medical Dictionary" F A Davis Company (2008) • "TUMORS, MALIGNANT | Carcinoma, Lymph Node Involvement" Encyclopedia of Respiratory Medicine (2006) • "Hurst's the Heart, 13th Edition: Two Volume Set" McGraw Hill Professional (2010) • "Applied Radiological Anatomy" Cambridge University Press (2012) • "Clinically Oriented Anatomy" Lippincott Williams & Wilkins (2013) • "Braunwald's Heart Disease" Saunders (2004) • "How to determine atrial situs? Considerations initiated by 3 cases of absent spleen with a discordant anatomy between bronchi and atria." Heart (1979) • "Essential Clinical Anatomy" Journal of Anatomy (2007)

[ The left border of heart (or obtuse margin) is formed from the rounded lateral wall of the obtuse marginal artery, which is the a branch of the It extends from a point in the second left This is contrasted with the acute margin of the heart, which is at the border of the anterior and posterior surface, and in which the acute marginal branch of the References [ ] This article incorporates text in the (1918) External links [ ] • •

• 1 Atria • 1.1 Right Atrium • 1.2 Interatrial Septum • 1.3 Clinical Relevance: Atrial Septal Defect • 1.4 Left Atrium • 2 Ventricles • 2.1 Right Ventricle • 2.2 Interventricular Septum • 2.3 Left Ventricle • 3 Clinical Relevance: Tetralogy of Fallot The heart consists of four chambers – two atria and two ventricles: • Blood returning to the heart enters the atria, and is then pumped into the ventricles. • From the left ventricle, blood passes into the aorta and enters the systemic circulation. • From the right ventricle, blood enters the pulmonary circulation via the pulmonary arteries. In this article we shall look at the anatomy of the chambers of the heart – their location, internal structure and clinical correlations. Atria Right Atrium The right atrium receives deoxygenated blood from the superior and inferior vena cavae, and from the coronary veins. It pumps this blood through the right atrioventricular orifice (guarded by the tricuspid valve) into the right ventricle. In the anatomical position, the right atrium forms the right border of the heart. Extending from the antero-medial portion of the chamber is the right auricle (right atrial appendage) – a muscular pouch that acts to increase the capacity of the atrium. The interior surface of the right atrium can be divided into two parts, each with a distinct embryological origin. These two parts are separated by a muscular ridge called the crista terminalis: • Sinus venarum – located posterior to the crista terminal...

AMA Citation Chapter 4. Heart. In: Morton DA, Foreman K, Albertine KH. Morton D.A., & Foreman K, & Albertine K.H.(Eds.), Eds. David A. Morton, et al.eds. The Big Picture: Gross Anatomy. McGraw Hill; 2011. Accessed June 15, 2023. https://accessmedicine.mhmedical.com/content.aspx?bookid=381§ionid=40140010 • Fibrous pericardium. A strong, dense collagenous tissue that blends with the tunica externa of the great vessels and the central tendon of the diaphragm. • Serous pericardium. Lines the inner surface of the fibrous pericardium. • Pericardial space. Lies between the serous layer of the parietal pericardium and the visceral pericardium. • Visceral pericardium (epicardium). A serous layer that intimately follows the contours of the heart surface. At the root of the heart, the visceral pericardium is contiguous with the serous pericardium, analogous to the visceral and parietal pleura of the hilum of each lung. + + • Transverse sinus. Lies posterior to the ascending aorta and the pulmonary trunk and anterosuperior to the left atrium and the pulmonary veins. • Oblique sinus. Lies posterior to the heart and is surrounded by the reflection of the serous pericardium around the right and left pulmonary veins and the inferior vena cava. + +