Vessel Overview Histology

Question 1

Two components of the vascular system?

Answer 1

1) cardiovascular system - transports blood (includes the heart, arteries, capillaries, and veins)
2) lymphatic system - which returns tissue fluid (lymph) from the tissues back to the cardiovascular system

Question 2

Vessels are three basic components….

Answer 2

1) tunica intima
2) tunica media
3) tunica externa

Question 3

Tunica intima

• made of what? other name?
• underlying?

Answer 3

a simple squamous epithelium called the endothelium, with underlying loose connective tissue

Question 4

Tunica media

-made of? (2)

Answer 4

thicker layer with smooth muscle and elastic fibers

Question 5

Tunica externa

• made of?
• other name?

Answer 5

dense connective tissue

adventitia

Question 6

cross section of a blood vessel

Answer 6

• blood is inside
• tunica media has smooth muscle cells that are circularly arranged (perpendicular to long axis of vessel)
• thin portion inside is the tunica intima

Question 7

see higher powered image of cross section of blood vessel with three layers!

Answer 7

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Question 8

the border between the intima and the media is wavy

Answer 8

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Question 9

video of vessel layers

just read notes

Answer 9

Artery!
Tunica media is most evident! – wraps circularly
Smooth muscle – nuclei long – lots of nuclei – nice eosinophila
Deep to intima – loose connective tissue – elastic layer in between with media
Adventitia – blends in with surrounding CT

Tunica media of vein has lots more CT and fewer smooth muscle cells

Question 10

What is the major histological difference between arteries and veins?

Answer 10

thickness and muscularity of the tunica media

arteries have a thicker, more muscular tunica media

Question 11

capillaries are composed of what?

Answer 11

endothelial cells without a tunica media or adventitia

Question 12

lymphatic vessels have a less developed what?

smallest lymphatic vessels have what?

Answer 12

tunica media

smallest lymphatic vessels have valves!

Question 13

hitologically, differentiating between arteries/arterioles and veins/venules is best done by comparing…

Answer 13

vessels of approximately the same size!

arteries have thicker smooth muscle layer so their wall is relatively thicker compared to the size of the vessel itself with a narrower lumen!

Question 14

shape of arteries/veins… diff?

Answer 14

arteries tend to be rounder

Question 15

arteries/veins can have blood cells in their lumen but they can be washed away in the prep.

Answer 15

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Question 16

all blood vessels are lined with what?

Answer 16

simple squamous epithelium - ENDOTHELIUM.

have flattened nuclei
the fatter nuclei in the wall of the vessel (particularly in arteries) belong to smooth muscle cells

Question 17

Capillaries are difficult to find and identify because consist mostly of endothelial cells and are thin walled

Answer 17

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Question 18

capillaries are apprx the size of what?

Answer 18

RBCs

Question 19

lymphatic vessels compared to veins…

Answer 19

thinner walls than veins

Question 20

lymphatic vessels will be devoid of….

Answer 20

RBCs!

Question 21

what will lymphatic vessels be filled with?

Answer 21

“colloid” from precipitated lymph fluid as well as WBCs

Question 22

veins also have valves but not in the smallest veins in the wall of an organ that we will see

Answer 22

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Question 23

pink colloid in lymph vessels are cellular!

Answer 23

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Question 24

in lymph vessels, will see a grater proportion of WBCs compared to arteries/veins

Answer 24

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Question 25

video of lung hilus notes

Answer 25

Vein has wider diameter lumen!

Valves are covered by SSE – wihtin organ and has valve – is lymphatic vessel

Question 26

study pictures on slides!! esp quiz

Answer 26

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