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ANAT 261 > Lab 6: circulatory system > Flashcards

Lab 6: circulatory system Flashcards

1
Q

name layers from lumen outwards

A

intima
media
adventitia

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2
Q

describe intima

A

endothelium - simple squamous with BM
subendothelium - loose CT between endothelium and IELM
internal elastic membrane (IELM) - not in all vessels, like elastic fibers in tunica media but thicker

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3
Q

describe media

A

smooth muscle
collagen type 3 - reticular fibers
elastic fibers

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4
Q

describe elastic fibers of media

A

visible layers that separate smooth muscles into clear layers
fenestrated elastic membrane
not present in all vessel types

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5
Q

describe adventitia

A

collagen type 1 (normal CT)
vasa vasorum - supply blood to large blood vessels, vessels of vessels
vasa nervosum

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6
Q

describe plane of section for endothelium

A

run length of blood vessel

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7
Q

describe plane of section for smooth muscle

A

when present = run circularly around blood vessel

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8
Q

describe plane of section in cross section

A

endothelium in cross section
smooth muscle in longitudinal section

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9
Q

describe plane of section in longitudinal section

A

endothelium in longitudinal section
smooth muscle in cross section

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10
Q

describe capillaries - gen

A

only see endothelium (simple squamous with BM) and nucleus
smallest vessel
8-10um in diameter - enough to let one rbc 7um through
abundant in brain and heart

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11
Q

what do capillaries not have

A

no media or adventitia

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12
Q

describe lumen of capillaries

A

lined with 1-2 endothelial cells
allows only 1 rbc to fit through

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13
Q

name the 3 types of capillaries

A

continuous
fenestrated
fenestrated sinusoids

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14
Q

what do the 3 types of capillaries define

A

3 layers of permeabilization

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15
Q

describe intima of arteriole

A

endothelium
Subendothelium thin
IELM likely absent

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16
Q

describe media of arteriole

A

1-3 layers
appears longitudinal in cross section

17
Q

describe adventitia of arteriole

A

very little/no adventitia

18
Q

describe intima of venule

A

endothelium present
subendothelium thin
no IELM

19
Q

describe media of venule

A

no smooth muscle layers
incomplete or absent media

20
Q

describe adventitia of venule

A

very little/no adventitia

21
Q

how to distinguish venule from arterioles and capillaries

A

different from ateriole since no media
different from capillaries since more than one rbc can flow at a time
more than 2 endothelial cells surround lumen in cross section

22
Q

describe intima of muscular artery

A

endothelium (endothelial cell)
IELM very clear

23
Q

describe media of muscular artery

A

4-10 layers of smooth muscle

24
Q

describe adventitia of muscular artery

A

dense irregular CT
thin - in larger vessels can have vasa vasorum

25
Q

describe how smooth muscle cells look in cross section and longitudinal section of muscular artery

A

cross section = nuclei of smooth muscle appears longitudinal
longitudinal section = smooth muscle appears in cross section

26
Q

describe intima of elastic artery

A

endothelial cell
IELM present but difficult to differentiate between elastic fibers in media

27
Q

describe media of elastic artery

A

smooth muscle appears longitudinal (when in cross section)
10-50 layers of smooth muscle with distinct elastic fibers

28
Q

describe adventitia of elastic artery

A

vasa vasorum for nutrients and oxygen

29
Q

can elastic arteries be easily seen in light microscopy

A

NO
so large that they may not be seen in light microscopy field all at once

30
Q

describe intima of large vein

A

no IELM (absent or undefined)
endothelial cells

31
Q

describe media of large vein

A

can contain some smooth muscle but much less than artery of equivalent size

32
Q

describe adventitia of large vein

A

looks thicker than size of media
has vaso vasorum

ANAT 261 (27 decks)

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