BIOL 1410 Lecture Notes - Lecture 17: Purkinje Fibers, Papillary Muscle, Pulmonary Vein
17 Nov 2014
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Biol 1410: anatomy of the human body - lecture 17: cardiovascular system. Enclosed by the mediastinum: a space between the lungs, within the thoracic cavity. Dense irregular ct: serous pericardium parietal pericardium. Fused to fibrous pericardium to form the pericardial sac visceral pericardium. Fused to heart surface pericardial cavity: between pericardial layers, contains serous fluid, lubricates during contraction, heart wall. Endothelium a. b. lines inner surface of heart lines blood vessels: chambers + associated blood vessels a) Aorta b) c) d: septa a) b) Connective tissue fibers allows openings to remain open at all times of chambers provides electrical insulation prevents simultaneous contraction. Between atria and ventricles bicuspid (mitral) valve i. ii. Chordae tendineae: valves a) b, attaches cusps to papilla of heart. Papilla projections of myocardium: prevent eversion of cusps. 3 cusps each i. ii. aortic pulmonary. Separates right ventricle and pulmonary trunk: cardiac muscle cells form both contractile myocardium + conduction system charactieristics, striated, sr and t-tubules.
