Transcript Exercise 20
Exercise 20 Gross Anatomy of the Heart BI 232 The heart Two-sided, doublepumping organ. The left side controls the flow of blood to all tissues and cells in the body, where oxygen and nutrients are delivered and wastes are taken away. The right side sends blood to the lungs, where oxygen stored in RBCs is replenished and CO2 is released The Pericardium Membranous sac 2 parts: outer fibrous pericardium that is fused to adjacent structures and an inner serous pericardium which is a delicate serous membrane that forms a double-layered sac around the heart. The serous pericardium consists of parietal and visceral layers. Mediastinum The heart and pericardial cavity are located within the mediastinum, a centrally located area within the thoracic cavity. External Anatomy of the Heart External Anatomy of the Heart Internal Anatomy of the Heart Coronary Circulation Coronary Circulation On the posterior surface of the heart, the coronary artery branches to become the posterior interventricular artery Near the apex of the heart the anterior and posterior interventricular arteries form an anastomosis (connection) Coronary Circulation On the posterior surface of the heart, the coronary sinus runs along the coronary sulcus and empties into the right atrium. Great cardiac vein found in the anterior interventricular sulcus Middle cardiac vein ascends along the posterior interventricular groove Blood flow Through the Heart Pulmonary Circulation- Blood from the right side of the heart flows to and from the lungs Systemic CirculationBlood from the left side of the heart flows from and to all body tissues. Position of Heart Base of the heart extends from the inferior border of the second costal cartilage on the left side to the superior border of the third costal cartilage on the right. Apex of the heart is located in the left fifth intercostal space, left of the median plane Today’s lab Dissect sheep heart ID structures on the heart models