Term
| Layers in wall of arteries |
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Definition
Tunica Intima
Tunica Media
Tunica Adventia |
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Term
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Definition
Weibal-Palade bodies - factor 7. blood clotting
sub endothelial layer of loose ct and occasional smooth muscle
Endothelium - simple squamous on basal lamina.
internal elastic lamina. Layer of elastin, seperates intima from media. |
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Term
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Definition
Layers of circularly arranged smooth muscle and elastin.
Reticular fibers and proteoglycans lie between smooth muscle
outer border is external elastic lamina. |
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Term
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Definition
Layer of CT with fibroblasts, longitudinally arranged elastic and collagen fibres
Merges with suurronding ct
limits vessels, holds in place. contains blood vessels and nerves |
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Term
| Elastic Artery Tunica Intima |
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Definition
endothelial cells produce cytokines, lympkines growth factors, and other molecules that control vasodilation/constriction, coagulation, and seletive permilibility
Larger Intima then other vessels |
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Term
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Definition
50-60 concentric, fenstrated elastic lamellae. concentric layeres of smooth muscle between elastic lamellae.
nerves and blood vessels. |
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Term
| Elastic Tunica Adventitia |
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Definition
thinner compared to muscular.
irregulary arranged collagen and elastic fibers. |
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Term
| Muscular(distributing) Tunica Intima |
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Definition
subendothelial layer thin or absent,
Thiner compared to Elastic Arteries
internal elastic membrane, prominent wavy strucutre - due to smooth muscle |
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Term
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Definition
mainly circularly arranged smooth muscle cells.
External elastic membrane not prominant.
Embedded in ct containing abundant collagen. few elastic fiberes |
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Term
| muscular Tunica Adventitia |
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Definition
thicker compared to elastic arteries
Rich in ollagen and elastic arteries |
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Term
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Definition
At birth only endothelium and I.E.M.
(no subendotheliium)
grwoth factors released from endothelium attract smooth muscle.
Smooth muscle produces elastin, collagen, and ground substance. |
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Term
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Definition
No Elastic tissue(lamina)
diameter less then 100um
Tunica media is main layer, 1-3 layers of circular smooth muscle.
regulates degree of pressure.(narrow lumen, thick muscular wall)
metarterioles control filling of capillaries(blood flow to organs) |
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Term
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Definition
| Have endothelium and basal lamina(supporting layer of ct) |
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Term
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Definition
CNS, Lung, muscles, and ct
endothelial cells have coomplete cytoplasm
lumen slightly larger then erythrocyte
many pinocytotic vesicles - fluid transport
held together by tight junction |
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Term
| discontinuous capillaries(sinusoids) |
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Definition
liver, spleen, bone marrow
No continuous cytoplasm
lumen up to three times larger then normal capillaries.
gaps occur between endothelial cells,(larger then fenestrations)
basement membrane(basal lamina) is discountinuous or absent |
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Term
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Definition
in renal glomeruli, endocrine, intestine, pancreas.
Have fenestrations(gaps in endothelium) |
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Term
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Definition
perivascular cells scattered around the outside of capillaries
- they have long cytoplasmic processes which extend around the blood vessel
- they may be phagocytic and have some contractile properties
- may differentiate into other cell types during growth or wound healing (muscle, fibroblasts) |
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Term
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Definition
Bypass capillaries.
thick, muscular walls
numerous in skin, thermoregulation |
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Term
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Definition
Post capillary Venules have no tunica media.
Histamine and serotonin cause extravastation of fluid and emigration of white blood cells |
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Term
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Definition
tunica adventitia is thickest coat.
tunica media thinner then artery of comparable size. circular arranged smooth muscle |
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Term
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Definition
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Term
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Definition
adventitia thickest layer, ct and smooth muscle.
Media layer thinner then in smaller veins |
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Term
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Definition
More abundant in veins then arteryes
Because - veins carry poorly oxygenated blood.
blood vessels in wall won't collapse
(lower pressure) |
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Term
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Definition
- arranged to permit blood to flow toward the heart but not in the opposite direction
- most valves consist of two leaflets or flaps - i.e. folds of intima with central ct
- valves are numerous in veins of the extremities - generally absent in thorax and abdomen
- occur distal to entrance of tributaries
- proximal to each valve is a localized swelling or sinus
- Function: 1) - to help overcome the force of gravity by preventing backflow
2) - to prevent back pressure on capillary beds during muscle contraction - valves enable skeletal muscle to serve as a pump |
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Term
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Definition
Epicardium
- layer on outer surface of heart
- mesothelium plus underlying connective tissue containing blood vessels and nerves
Myocardium
- cardiac muscle fibers with numerous b.v.'s between fibers
- myocardium of ventricles thicker than in atria
Endocardium:
4 layers:
1. endothelium
2. subendothelial layer of connective tissue
3. middle layer of dense connective tissue and smooth muscle cells
4. subendocardial connective tissue which is continuous with ct of myocardium |
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