2Objectives List the chambers of the heart. Describe the internal features of right atrium.Describe the internal features of the right ventricle.Discuss internal features of the left atrium.Discuss the internal features of the left ventricle.Differentiate between right and left ventricles.Define conducting system of the heart.
3Chambers of Heart Right Atrium Right Ventricle Left Atrium Left Ventricle
7Right Atrium Posterior wall of the right atrium: • Opening of the superior vena cava• Opening and valve of the inferior vena cava• Opening and valve of the coronary sinus• Fossa ovalis and the limbus fossa ovalisAnterior wall of the right atrium:• Pectinate muscles• Crista terminalis
9Right VentricleTricuspid valve has three cusps: anterior, septal, and posterior.Three papillary muscles: anterior, septal, and posterior. The anterior papillary muscle is the largest and most prominent.Trabeculae carneae (rough muscular ridges).
10Right VentricleThe septomarginal trabecula (moderator band): extends from the interventricular septum to the base of the anterior papillary muscle.The conus arteriosus (infundibulum): is the cone-shaped portion of the right ventricle inferior to the opening of the pulmonary trunk.The pulmonary valve: consists of three semilunar cusps: anterior, right, and left.
16Valves of the Heart 3 4 2 1 Right Atrioventricular (Tricuspid) Left Atrioventricular (Bicuspid or Mitral)PulmonaryAortic3421
17Fibrous Skeleton of the Heart Dense collagenous fibrous tissue framework liesat the junction of the atria with the ventricles.Includes:1-Tricuspid fibrous annulus: 2-Mitral fibrous annulus3-Pulmonary fibrous annulus: 4-Aortic fibrous annulusFunctions:1-Supports the valves. 2-Electrically separetes atria from ventricles.