Histology - Vasculature Images

Question 1

Answer 1

Arrows point to Vasa Vasorum

Question 2

Answer 2

Arteriole - H&E

Question 3

Answer 3

Venules

Question 3

Answer 3

Large Vein

Example - Superior Vena Cava

Question 4

Answer 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).

Question 5

Answer 5

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

Question 5

Answer 5

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

Question 6

Answer 6

• Cardiac Valves - Specializations of the endocardium (Tunica Intima).
• Extensions of fibroelastic tissue deep to endothelium.

Question 8

Answer 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.

Question 8

Answer 8

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

Question 8

Answer 8

Tunica Adventitia

Question 9

Answer 9

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

Question 10

Answer 10

Arrows point to Weibel-Palade bodies

Question 12

Answer 12

Valve leaflets

Core of subendothelial CT covered by endothelium

Question 14

Answer 14

Continuous (type I) Capillary - TEM

Question 16

Answer 16

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

Question 17

Answer 17

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

Question 18

Answer 18

External Elastic Lamina (EEL)

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

Question 19

Answer 19

Medium vein - example - cephalic vein

Question 20

Answer 20

Precapillary sphincter - Red circle and arrows

Question 21

Answer 21

Atherosclerotic Plaque - Within the tunica intima.

Question 22

Answer 22

tunica adventitia

Question 23

Answer 23

Continuous (type I) Capilarries - LM

Question 24

Answer 24

Purkinje Fibers

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

Question 25

Answer 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.

Question 26

Answer 26

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