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what kind of vessel is this? and what is the green arrow pointing to? 
- 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
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- 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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