lecture 12/13: Histology of CV System (Baekey)

Question 1

Where is number of vessels and cross sectional area greatest?

Answer 1

capillaries

Question 2

where is most blood volume?

Answer 2

veins

Question 3

What kind of vessel has the most elastic tissue?

Answer 3

large arteries

Question 4

in which vessels is elastic tissue absent?

Answer 4

capillaries, venules

Question 5

Table p. iii on Histo section in SCAVMA

Answer 5

:)

Question 6

how do blood vessels develop?

Answer 6

vacuole fusion

Question 7

how are endothelial cells joined?

Answer 7

intercellular junctions

Question 8

Components of tunica intima in elastic arteries (3)

Answer 8

endothelium, subendothelium, internal elastic membrane

Question 9

Components of tunica media in elastic arteries (3)

Answer 9

smooth muscle, elastic fibers, collagenous fibers

Question 10

Components of tunica externa in elastic arteries (3)

Answer 10

collagenous fibers, nervi vasorum, vasa vasorum

Question 11

vasa vasorum

Answer 11

network of small blood vessels that supply large blood vessels (“vessels of the vessels”)

Question 12

Difference b/w elastic and muscular arteries

Answer 12

exactly the same, except muscular arteries do not have collagenous fibers

Question 13

Pericytes

Answer 13

aka pericapillary cells.Wrap around fenestrated capillaries to keep proteins in the capillaries and let fluid through (regulate permeability through capillary to help create urine)

Question 14

How is blood flow regulated through capillaries?

Answer 14

precapillary sphincters of arteriole control flow into capillary bed proper. Anteriolar-venous anastomoses connect terminal arteriole directly with a venule

Question 15

continuous capillary and found where?

Answer 15

tight junctions between endothelial cells. Found in muscle, lungs, nervous system

Question 16

fenestrated capillaries are found where?

Answer 16

pores present in endothelial cells and basal lamina. Found in endocrine glands, intestine, kidneys

Question 17

Sinusoidal capillaries and where found?

Answer 17

large diameter and gaps. Basal lamina diminished or absent. Found in liver, spleen, bone marrow

Question 18

Tunica media and intima in veins vs. arteries

Answer 18

veins have less developed/thinner tunica intima and media than arteries

Question 19

venules

Answer 19

Formed where several capillaries meet. May form portal systems b/w two capillary networks (i.e. hepatic)

Question 20

tunica intima of veins contains (3)

Answer 20

endothelium, thin subendothelium, valves

Question 21

tunica media of veins contains

Answer 21

limited muscle and elastic fibers

Question 22

tunica externa of veins contains

Answer 22

collagenous fibers

Question 23

Endocardium in heart includes: (3)

Answer 23

endothelium, subendothelial coat, subendocardial coat. Analogous to tunica intima

Question 24

Myocardium in heart =

Answer 24

cardiac muscle

Question 25

epicardium in heart includes (2)

Answer 25

subepicardial coat, serous mesothelium

Question 26

between which layers are purkinje fibers located

Answer 26

endocardium and myocardium

Question 27

epicardium =

Answer 27

visceral pericardium

Question 28

annuli fibrosi

Answer 28

fibrous rings that surround each of the heart valves in bovine. Continuous with the connective tissue of the valve

Question 29

ossa cordis

Answer 29

bone formation around aortic valve in bovine

Question 30

trigonum fibrosum

Answer 30

fibrous triangle b/w AV canals in dogs

Question 31

lymph capillary vs. capillary

Answer 31

lymph capillaries have little or no basal lamina (makes them more permeable). Also have anchoring microvilli

Question 32

Lymph vessel vs. vein

Answer 32

thinner walled, irregularly shaped, tunics not well defined

Question 33

what kind of artery is aorta?

Answer 33

elastic artery

Question 34

where is external elastic membrane located?

Answer 34

between tunica externa and tunica media

Question 35

Veins have ______ band of internal elastic membrane, while arteries have ______ band of internal elastic membrane

Answer 35

discontinuous; continuous

Question 36

What structures are present in connective tissue between artery and veins?

Answer 36

nervi vasorum, vasa vasorum, arterioles, capillaries

Question 37

What kind of cells are glands (i.e. bile duct) surrounded by?

Answer 37

cuboidal

Question 38

glomerular capillaries =

Answer 38

fenestrated capillaries

Question 39

podocyte

Answer 39

a specialized pericyte in the glomerulus of the kidney. Wrap around fenestrated capillaries to keep proteins in the capillaries and let fluid through (regulate permeability through capillary to help create urine)

Question 40

mesangial cells

Answer 40

form the "glue" that holds fenestrated capillaries in a ball within glomerulus

Question 41

sinusoidal capillary diameter compared to continuous and fenestrated capillaries

Answer 41

larger

Question 42

portal triad contains

Answer 42

bile duct + artery + vein

Question 43

what makes up skeleton of valves?

Answer 43

hyaline cartilage. Stains purple/blue