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  1. what kind of vessel is this? and what is the green arrow pointing to?Image Upload 1
    • Large Vein
    • Green arrow: layer of coarse collagen and elastic fibers separating the smooth muscle bundles in the t. media and t. adventitia
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    Atypical vessel-coronary artery which has a thick tunica media compared to other medium sized muscular vessels
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    Atypical vessel-great saphenous vein, has increased smooth muscle in all tunicas and is often used for CABG
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    Atypical Blood Vessel-central adrenomedullary vein, has an irregular arrangement of smooth muscle
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    Lymphatic vessels have valves and anchoring filaments
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    • A-Atria
    • B-Coronary vessel
    • C-mitral valve
    • D (top right)-Fat
    • D(bottom left)-endocardium
    • E-epicardium
    • Smiley-myocardium
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    • A-spongiosa
    • B-fibrosa
    • C-ventricularis
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    purkinje fibers, iron hematoxylin
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    • Purkinje fibers, iron hematoxylin note peripheral displaced myofibrils (red arrows), nucleus surrounded by clear area (glycogen)
    • Striations are striated muscle filaments making them contractile
  10. Image Upload 10
    • Purkinje cells of the impulse-conducting system. They are characterized by a reduced number of myofibrils that are present mainly in the periphery of the muscle cell.
    • The light area around the nuclei of the conducting cells is caused by a local accumulation of glycogen. High magnification. H&E stain doesn't show striations very well
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