Histology - Circulatory System

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Created Dec 11, 2009
by ejberg
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circulatory flow
elastic arteriestomuscular arteriestoarteriolestocapillariestopostcapillary venulesto medium-sized...
blood vessel composition (3 layers)
1 - tuncia intima2 - tunica media3 - tunica adventitia
tunica intima
*delimits the vessel wall towards the lumen of the vessel and comprised its endothelial lining...
tunica media
*formed by a layer of circumferential smooth muscle and variable amounts of connective tissue*a...
tunica adventitia / externa
* outter most layer; surrounds tunica media*consists mainly of connective tissue fibers (COLLAGEN...
arteries
*3 types (large elastic, medium muscular, small arteries/arterioles)*specialization of arterial...
elastic arteries
*large*tunica intima of elastic arteries thicker than in other arteries*layer of subendothelial...
vasa vasorum
blood vessels in tunica adventitia that nourish cells of tunica media and tunica adventitia
muscular arteries
*tunica media thinner than in elastic arteries*subendothelial connective tissue other than...
arterioles
*diameter less than 0.1 to 0.5mm *endothelium still rests on internal elastic lamina - which...
capillaries
*sum of diameters of all capillaries is significantly larger than that of the aorta - which...
pericytes 
*@capillaries*incomplete layer of cells surrounding capilaries*contractile properties*regulate...
veins
*walls of veins are thinner than walls of arteries*diameter is larger than that of arteries*layering...
vein valves
*loose, pocket-shaped folds of tunica intima*extends into the lumen of the vein*opening of...
lymphatic vessels
parts of the blood vessels with exude from the blood vessels into the surrounding tissues because...
lymph capillaries
*larger than blood capillaries*very irregularly shaped*begin as blind-ending tubes in connective...
lymph vessel
*formed from merging lymph capillaries*larger than lymph capillaries - though otherwise very...
lymph ducts
*one or two layer of smooth muscle cells in wall*form vales*movement of lymph toward the heart...
thorasic duct
largest lymph duct, 5mm in diameter, drians lymph from the lower half and upper left quadrant...


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