SMALL ARTERIES amp ARTERIOLES lt05mm lumen Thin subendothelial connective tissue Int elastic lamina absent in small arterioles T Media smooth muscle layer Adventitia is thin Hypertension ID: 1041430
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1. HISTOLOGY OF CIRCULATORY SYSTEM III
2. SMALL ARTERIES & ARTERIOLES<0.5mm lumenThin subendothelial connective tissueInt. elastic lamina absent in small arteriolesT. Media: smooth muscle layerAdventitia is thinHypertension
3. CAPILLARIESDiameter : 5-7 µmSingle layer of endothelium; permit metabolic exchangeFunction in groups- Capillary BedsRichness conforms to metabolic activity of tissueStructure and pulsatile flow of blood through capillaries and thoroughfare channel.
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5. TYPESContinuousFenestratedSinusoidal
6. CONTINUOUS CAPILLARIESNo fenestrations, complete basal laminaPinocytic vesiclesLocation:Muscles, nervous tissue, exocrine glands
7. FENESTRATED CAPILLARIESTranscellular openings (80nm)Limited by cell membraneCovered by diaphragm ( thinner than cell membrane, proteoglycans)In endocrine glandsKidneys etc
8. SINUSOIDAL CAPILLARIESDiameter 30-40µmEndothelial cells discontinuous layerFenestrations without diaphragmIncomplete basal laminaMacrophagesFound in liver, hematopoietic organs
9. PERICYTESCells at periphery of continuous capillariesenclosed in own basal laminaMesenchymal originActin, myosin– contractile propertiesRole in repair processDiabetic Microangiopathy
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11. POST CAPILLARY VENULEDiameter 0.5-1mmEndothelium + thin subendothelial connective tissueMedia– pericytesMUSCULAR VEINSThin subendothelial layer, may be absentMedia: smooth muscles + reticular fibers valves
12. Inflammation & Edema
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14. LARGE VEINSWell developed intimaThin mediaVery thick adventitiaFurther three layersSmooth muscles
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16. LYMPH VASCULAR SYSTEMLYMPH CAPILLARIES:Single layer of endotheliumIncomplete basal laminaLYMPH VESSELS:Structure similar to veins, thinner wallsLARGE DUCTS:Similar to veins, smooth muscles
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19. Medical ApplicationMetastasisLymph edema