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V - KCU - CP (T2) - OMS1 > Vascuar Histology > Flashcards

Vascuar Histology Flashcards

1
Q

What are the three layers of the tunica intima

A

Endothelium
Basal lamina
Subendothelial layer

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2
Q

What makes up the endothelial layer of the tunica intima

A

A single layer of squamous epithelial cells with a basal lamina containing a thin EC layer

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3
Q

What makes up the subendothelial layer and what makes up the internal elastic membrane

A

Loose CT with an internal elastic membrane Which is made up of fenestrated elastic material

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4
Q

What is the purpose of the subendothelial layer

A

To link the endothelial layers to the other ones

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5
Q

What is the purpose of the internal elastic membrane

A

Allows for nutrients to diffuse across the tunica

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6
Q

What makes up the smooth muscle

A

Smooth muscle with a layer of elastin that comprises the external elastic membrane

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7
Q

Describe the tunica adventitia

A

Longitudinally arranged collagenous tissue w/few elastic fibers.

Merges with the loose CT surrounding the vessels

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8
Q

Define the vasa vasorum

A

Supplies blood to the vascular walls themselves

This is how the larger vessels get their nutrients

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9
Q

Define the nervi vasorum

A

ANS input that controls contraction of vascular smooth muscle

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10
Q

The vasa vasrum and nervi vasorum are part of that tunica

A

Tunica adventitia

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11
Q

What are the defining characteristics of large (elastic) arteries

A

Elastin which forms concentric sheets between muscle cell layers

No fibroblasts

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12
Q

What synthesizes collagen, elastin, and ECM in large arteries

A

Smooth muscle

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13
Q

Medium (muscular) arteries have more what and less what in compared to larger arteries

A

More SM and less elastin

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14
Q

What becomes readily aparent in the medium arteries

A

Internal elastic membrane and the external elastic membrane

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15
Q

Is the tunica adventitia thick or thin in medium arteries

A

Thick

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16
Q

How many layers do small arteries have or tunica media smooth muscles

A

Up to 8 with an internal elastic membrane

17
Q

How many layers of smooth muscle in the tunica media will the arterioles have

A

1 - 2 layers

18
Q

What are the duties of the arterioles

A

Flow regulators for the peripheral capillary beds through sympathetic (vasoconstriction) or parasympathetic (vasodilation) innervation

Innervation is in the tunica media

19
Q

Capillaries only have what type of layering

A

Endothelium with tunica intima

20
Q

What surround the capillary beds and what is their role

A

Pericytes - enclosed within the basal lamina that is continuous with the endothelium

Promotes stability of capillaries and post-capillary venules

21
Q

What are the first branches of the arteriole supply the tissue

A

Metarterioles

22
Q

What is the thoroughfare channel and what does it lack

A

Distal end of metarteriole

Lacks SM

23
Q

Define true capillaries

A

Branch from metarteriole and lack SM

24
Q

Contracted precapillary sphincters will cause what

A

A shunt of blood to flow through the capillaries, causing faster VR and less exchange within true capillaries

25
Q

The lumen of arteries or veins is bigger

A

Veins

26
Q

What doe postcapillary venules do and what do they not contain

A

Drain capillaries

No true tunica media

27
Q

What is the first vein to have all three layers of tunica

A

Small veins

28
Q

Tunica media have thicker what

A

Adventitia

29
Q

Muscular venules have what in regards to smooth muscle and tunica adevntitia

A

1-2 layers of SM in tunica media and a thin tunica adventitia

30
Q

What is the thickest layer of the large veins

A

The tunica adventitia

31
Q

What does the tunica adventitia of large veins contain

A

Collagen and elastic fibers AND fibroblasts

32
Q

Where is the smooth muscle found in large veins

A

Tunica adventitia

33
Q

Which type of vein contains valves

A

Medium veins

V - KCU - CP (T2) - OMS1 (20 decks)

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