Histology - Vasculature Images Flashcards Preview

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Flashcards in Histology - Vasculature Images Deck (26)
1

Arrows point to Vasa Vasorum

2

Arteriole - H&E

3

Venules

3

Large Vein

Example - Superior Vena Cava

4

Sinusoidal (discontinuous) capillary

Large irregular lumen. Discontinuous basal lamina. Found in Bone marrow, liver, spleen (sites of fluid & cell migration in & out of BV).

5

Elastic (conducting) artery. 40-70 fenestrated elastic sheets. Example - aorta.

5

Fenestrated (type II) Capillary. Fenestrations, complete basal lamina. Found in endocrine organs, GI tract, kidney.

6

- Cardiac Valves - Specializations of the endocardium (Tunica Intima).

- Extensions of fibroelastic tissue deep to endothelium.

8

Muscular arteries

Draw blood from an elastic artery and branch into "resistance vessels" including small arteries and arterioles. They contain layers of smooth muscle.

8

muscular arteries and medium veins - often found next to each other. 

8

Tunica Adventitia

9

Internal Elastic Lamina (IEL). Permits diffusinof nutrients and waste between lumen, cells in tunica intima, and the cellsin inner half of tunica media. 

10

Arrows point to Weibel-Palade bodies 

12

Valve leaflets

Core of subendothelial CT covered by endothelium

14

Continuous (type I) Capillary - TEM

16

Muscular (distributing) artert. 5-40 layers of smooth muscle. Example - internal thoracic artery

17

Tunica Media. Smooth muscle, contractile and/or secretory, coordinate via gap junctions.

18

External Elastic Lamina (EEL) 

Separates tunica media from TA, secreted by smooth muscle cells of the tunica media. 

19

Medium vein - example - cephalic vein

20

Precapillary sphincter - Red circle and arrows

21

Atherosclerotic Plaque - Within the tunica intima.

22

tunica adventitia

23

Continuous (type I) Capilarries - LM

24

Purkinje Fibers 

Modified cardiac muscle fibers, located in subendocardial, (not epithelial). Large pale-looking (“moth-eaten) cells.

25

Arteriole

 muscular walls (usually only one to two layers ofsmooth muscle), the primary site of vascular resistance.

The greatest change in blood pressure and velocity of blood flow occurs at the transition of arterioles to capillaries.

 

26

Transmission electron micrograph of a microvessel, showing pericytes characteristically lining the outer surface of endothelial cells, which encircle an erythrocyte (E).