HLSC 2465U Lecture Notes - Lecture 8: Tunica Externa, Purkinje Fibers, Tunica Media
Document Summary
Think of layers : endocardium (inside, myocardium (muscle, epicardium (outside) Epicardium is also known as the pericardium. Endocardium also has 3 layers itself : coated with simple squamous endothelium, dense ct, smooth muscle, elastic fibres, subendocardium loct, purkinje fibres, nerves, purkinje fibres are involved in contraction, please know that purkinje cells (brain) and purkinje fibres. Epicardium: pericardium, 2 layers, fibrous pericardium, epicardium, outside layer mesothelium simple squamous endothelial. Arteries transition into arterioles, capillaries, venules, and veins. Three layers of vessels (except for capillaries only one layer) 3 layers in general: tunica intima (inner) Inner endothelium: tunica media (middle, lots of smooth muscle or some elastin, tunica adventitia (outer, ends with simple squamous (mesothelium, elastic fibres, blood vessels. Difference between an artery and a vein: tunica media much thicker in an artery, veins sometimes contain valves. Arterial system: deliver o2 to the tissues, aorta, pulmonary arteries (elastic arteries, medium sized muscular arteries, smallest arterioles.
