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28 Cards in this Set
- Front
- Back
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Heart develops from a simple blood vessel and thus retains the 3 concentric tunics of vessel walls
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cardiac muscle
Lf = lipfuscin pigment |
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Cardiac muscle
SM = smooth muscle surrounding artery |
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Ischemia;
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Left ventricular wall
Tunica intima = Endocardium (E) Tunia media = Myocardium (thickest in L ventricle) Tunica adventicia (epicardium or visceral pericardium) Papillary muscles = myocardium extensions that form anchors for chordae tendinae that tether the cusps to the AV valve (for left ventricle = mitral valve) |
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Atrial Wall
Ct = connective tissue; separates cardiac muscle fibers |
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Atrial Natriueretic Fiber; stimulates diuresis, relaxes cardiac muscle by inhibiting vasopressin and angiotensin II, prevents hypervolemia and hypertension, pressure across atrial wall induces ANF release
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Aortic Valve; contains dense collagen matrix, continous with cardiac skeleton w/ anchors at the valve base; arrows indicate elastic fiber network under intima
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LEft AV valve (bicuspid = mitral)
F = lamina fibrosa in core of valve |
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Av node
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interventricular septum; left branch bundle
P = purkinje fibers; just deep to endocardium lining the IV septum |
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Arteries have thicker walls than aorta
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Aorta; larger lumen relative to wall thickness
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Aorta
note fenestrated elastic sheet |
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Aorta; elastif fibers in tunica media
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Aorta; elastif fibers in tunica media
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Marfans Aorta
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Muscular artery; two elastic sheets (internal elastic lamina, external elastic lamina); tunica media contains concentrically arranged smooth muscle
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Muscular artery; 2 elastic layers (dark staining)
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Vein Histology
Varicose veins = weak tunica media |
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Superior Vena Cava; tunica media not well developed; circular smooth muscle; adventicia is thickest tunic, longitudinal smooth muscles, helical collagen/elastic fibers
Compared to arterial walls, veins have more extensive vasa vasorum |
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Arrows = valve leaflets in vein
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Muscular venule has thin wall and relatively larger lumen than arteriole
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Arterioles -> Capillaries
Arterioles -> metaarterioles -> capillaries Arterioles shunt blood via sphincter constrictions |
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Capillary Portal Systems
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Lymphatics
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Lymphatic velve
One layer of flat endothelial cells; incomplete basement membrane with gaps; small/medium lymph vessels contain valves (thinner than venous valves, V/arrows on pic) |
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Medium Lymphatic Vessel
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