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18 Cards in this Set
- Front
- Back
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What is are 3 layers of a blood vessel
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what are the 3 layer composed of
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- intima- single layer SQUAMOUS endothelial cells, BASAL LAMINA & thin layer CT
- media- SMOOTH MUSCLE with ELASTIC fibres (arteries) - adventitia- CT |
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identify arterioles by their layers
role |
less smooth muscle in media
v.little adventitia resistance- control flow |
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walls of capillaries
3 types of capillaries |
endothelial cells & basal lamina
PERICYTES at intervals (outside basal lamina) 1) continuous 2) fenestered (pores) 3) sinusoidal/ discontinuous (lack basal lamina e.g. liver) |
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what are pericytes- role
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looc at intervals outside basal lamina of capillaries
CT cells with CONTRACTILE properties |
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what are precapillary sphincters and where are they located
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smooth muscle at start of capillaries- help CONTROL flow
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character of media in veins & another obvious feature
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THIN media
VALVES |
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how would you identify endocardium on a micrograph
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endothelium, basal lamina, think layer callgen, dense layer CT, subendocardium (loose CT- impulse conducting system)
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how would you identify myocardium on a micrograph
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thick middle layer, myocytes with SINGLE CENTRAL nucleus, INTERCALATED discs reg intervals- gap junctions
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how would you identify epicardium on micrograph (visceral layer of pericardium)
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MESOTHELIUM (single layer flattened epithelium), fibroelastic CT & adipose, Coronary arteries!
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what cell type lines serous pericardium
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THIN
simple SQUAMOUS epithelium= MESOTHELIUM basal lamina & CT |
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what's the fibrous heart skeleton composed of
purpose |
thick bands of CT
support valves and is attachment for myoycytes |
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what are heart valves composed of
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outer endothelial cells & basal lamina
collaggen & elastin CORE dense LAMINA FIBROSA (continuous with firbous skeleton) no blood vessles |
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3 cellular components of the heart
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1) CONTRACTILE 99%
2) PACEMAKER 3) CONDUCTING |
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how do Pacemaker cells appear on a micograph
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small
embedded in more extrinsic matrix of CT pale irregular arrangement |
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identify the purkinjie fibres
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PALER & LARGER than myocytes
subendocardium (no intercalated discs like myocytes) |
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wall of lymphatic vessels
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start as blind-ending sacs
ENDOTHELIUM |
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which vessel is which
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