Anatomy Study Guide exam IV

Anatomy Study Guide exam IV - Anatomy Study Guide Heart •...

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Unformatted text preview: Anatomy Study Guide Heart • Self adjusting muscular double pump, 2 parts of which act in concert Layers of Heart • Pericardium : Balloon like structure surrounding and protecting the heart o Parietal Pericardium: outer wall “part of balloon not in contact with fist” o Pericardial cavity: fluid space between the parietal, and visceral o Visceral pericardium ( epicardium ): inner wall “part of balloon in contact with fist” Fibrous pericardium: connects the epicardium to the cardiac muscle • Myocardium : muscle fibers of heart, associated with blood vessels o Muscle fibers are thicker in ventricles, and much thinner in atrial myocardium o Muscle fibers change orientation the deeper you go Superficial ventricular muscles wrap around both ventricles Deep ventricular muscles spiral around and between the ventricles Almost entirely aerobic • Endocardium : inner surface of the heart o Areolar connective tissue: connects endothelium to myocardium o Endothelium: simple squamous cells lining the inside of heart, including valves Basic Structure of Heart • Four chambers o Left Atrium Pumps into left ventricle from pulmonary vein o Right Atrium Pumps into right ventricle from vena cava o Left Ventricle Pumps into Aorta o Right Ventricle Pumps into Pulmonary Artery • Vessels leading to and from the Heart o Ascending and Descending Vena Cava Right Atrium o Pulmonary Artery from right ventricle Lungs (deoxygenated) o Pulmonary Veins (4) Left Atrium o Aorta blood from left ventricle Body • Valves o Right AtrioVentricular/Tricuspid : between right atrium and right ventricle o Left Atrioventricular/Bicuspid/Mitral : Between Left atrium and ventricle o Pulmonary Semilunar : Right ventrical and pulmonary arteries o Aortic Semilunar : left ventricle and aorta • Septa o interatrial: seperates atrium Foramen Ovale: o Interventricular: Between ventricles deep • Sulci o Coronary Sulcus: dividing line between atria and ventricles o Interventricular Anterior/Posterior: dividing lines between ventricles • Trabeculae carneae: Irregular muscular columns on the inner wall of ventricles • ligamentum arteriosum: Coronary Circulation • Left coronary A. o Left Anterior Descending: o Circumflex: • Right Coronary A. o Posterior interventricular A.: o Marginal A.: • Veins o Great cardiac : runs with LAD o Middle cardiac : runs with posterior interventricular o Coronary sinus: Cardiac Conduction System • S-A node : found in the posterior wall of right atrium, near the right vena cava entrance o Pacemaker of the heart, it depolarizes around 60-100 times a minute resting o Acetylcholine from parasympathetic slows HR (vagus nerve)...
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Anatomy Study Guide exam IV - Anatomy Study Guide Heart •...

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