Veins Flashcards

0
Q

What are medium veins? Examples?

A

1-10 mm

Most named veins e.g. external jugular vein

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1
Q

What are large veins? Examples?

A

> 1cm

Vena cava, pulmonary vein

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2
Q

What are small veins?

A

0.1-1mm

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3
Q

What are venules?

A

10-100 um

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4
Q

T or F: Large veins tend to be companion vessels to large arteries

A

T (same down to the venule/arteriole level)

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5
Q

Describe the tunica intima in veins

A

Longitudinally oriented components
Endothelial layer
Small or absent subendothelial layer
ABSENT internal elastic membrane

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6
Q

Describe the tunica media in veins

A

Circularly oriented components
Smooth muscle cells
Collagen fibers

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7
Q

Describe the tunica adventitia in veins

A

Smooth muscle cells (longitudinal bundles in large veins)
Collagen fiber layer with fibroblast cells
Vasa vasorum and nerve fibers

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8
Q

T or F: The tunica media is considerably thinner in veins than in arteries

A

T

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9
Q

T or F: The internal elastic membrane is absent in veins and present in arteries

A

T (important distinction)

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10
Q

What is the most pronounced layer in large veins?

A

T. adventitia

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11
Q

What is the makeup of the tunica adventitia in large veins?

A

Large smooth muscle bundle, clusters of collagen fibers and extensive vasa vasorum

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12
Q

T or F: Some veins have an internal elastic membrane

A

T but not common

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13
Q

Compared to the artery, the vein has what type of lumen? Wall?

A

Wider and thinner

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14
Q

What is the pampiniform plexus?

A

Complex system of branching veins for the venous drainage of the testes

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