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Histology - Vasculature Images

Anatomy and Physiology26 CardsCreated about 1 month ago

Vasa vasorum are small blood vessels that supply the walls of large arteries and veins (like the aorta). They are visible in the tunica adventitia and provide nutrients to outer vessel layers too thick for diffusion alone. Arterioles are small arteries with a narrow lumen and 1–2 layers of smooth muscle in the tunica media. In H&E stain, they appear as round structures with a well-defined muscular wall and relatively little surrounding connective tissue.

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Key Terms

Term
Definition

Arrows point to Vasa Vasorum

Arteriole - H&E

Venules

Large Vein

Example - Superior Vena Cava

Sinusoidal (discontinuous) capillary

Large irregular lumen. Discontinuous basal lamina. Foun...

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

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Histology - Vasculature Images
TermDefinition

Arrows point to Vasa Vasorum

Arteriole - H&E

Venules

Large Vein

Example - Superior Vena Cava

Sinusoidal (discontinuous) capillary

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

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

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

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

  • Extensions of fibroelastic tissue deep to endothelium.

Muscular arteries

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

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

Tunica Adventitia

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

Arrows point to Weibel-Palade bodies


Valve leaflets

Core of subendothelial CT covered by endothelium

Continuous (type I) Capillary - TEM

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

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

External Elastic Lamina (EEL)

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

Medium vein - example - cephalic vein

Precapillary sphincter - Red circle and arrows

Atherosclerotic Plaque - Within the tunica intima.

tunica adventitia

Continuous (type I) Capilarries - LM

Purkinje Fibers

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

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.


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