Specimen:

Specimen Details:

Organ: Artery and Vein
Origin: Human
Staining: RFAL

Method and Specimen Description:

Normal histological sections were stained with RFAL, which distinctly highlights the elastic fibres within the vessel walls.

Objective of the Examination:

• To understand the structural differences between arteries and veins.
• To study the wall structure of a muscular artery.

Special Features of the Specimen:

Even under low magnification, a marked difference between the artery and the vein is evident: the arterial wall is considerably thicker than the venous wall. However, this rule applies only to vessels of the same drainage area; in some regions, a vein may possess a thicker wall than an artery from another area.

Artery:

• The endothelium lies directly on the internal elastic lamina; a subendothelial layer is only weakly developed (best seen at high magnification).
• The internal elastic lamina appears strongly convoluted due to contraction of the muscular tunica media during fixation.
• The media consists of smooth muscle cells interspersed with a few elastic fibres, markedly fewer than in the aorta.
• The adventitia is thinner and less distinct than that of the aorta, containing small connective tissue elements and vasa vasorum in some areas.

Vein:

• The endothelium is clearly visible, and a subendothelial layer is present.
• The tunica media is relatively narrow, containing fewer smooth muscle cells and only sparse elastic fibers.
• The internal elastic lamina is thin and less corrugated, reflecting the weaker muscular component.
• The tunica adventitia is poorly defined, merging gradually into the surrounding connective tissue.

Tasks:

1. At low magnification, identify and distinguish the artery and vein.
2. Compare the muscular thickness of the tunica media in both vessels.
3. Evaluate the presence and arrangement of elastic fibers and the internal elastic lamina in each vessel.
4. Examine the smaller vessels in the vicinity of the larger ones.
5. Locate and identify the nerve cross-section visible within the specimen.

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