Exercise 20The heartThe PericardiumMediastinumExternal Anatomy of the HeartSlide 6Internal Anatomy of the HeartCoronary CirculationSlide 9Slide 10Blood flow Through the HeartPosition of HeartToday’s labExercise 20Gross Anatomy of the HeartBI 232The heartTwo-sided, double-pumping 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 releasedThe PericardiumMembranous sac2 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.MediastinumThe heart and pericardial cavity are located within the mediastinum, a centrally located area within the thoracic cavity.External Anatomy of the HeartExternal Anatomy of the HeartInternal Anatomy of the HeartCoronary CirculationCoronary CirculationOn the posterior surface of the heart, the coronary artery branches to become the posterior interventricular arteryNear the apex of the heart the anterior and posterior interventricular arteries form an anastomosis (connection)Coronary CirculationOn 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 sulcusMiddle cardiac vein ascends along the posterior interventricular grooveBlood flow Through the HeartPulmonary Circulation- Blood from the right side of the heart flows to and from the lungsSystemic Circulation- Blood from the left side of the heart flows from and to all body tissues.Position of HeartBase 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 planeToday’s labDissect sheep heartID structures on the heart
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