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Venules

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Venules drain capillary beds.

Tunica Externa

Present and unremarkable

Tunica Media

Present and unremarkable

Tunica Interna (Intimia)

Simple squamous epithelium

Lumen

Much like veins, venules are unable to maintain a shape upon fixation to a slide.  They appear like frown on a clown.

Histological section displaying a venule stained with Hematoxylin and Eosin (H&E). Pink staining indicates cytoplasm and extracellular matrix; purple highlights cell nuclei. The venule's endothelial lining is prominent. Surrounding tissue includes fibrous connective tissue and adipocytes (white space with thin cell membranes). The composition is a close-up, high-magnification view.
Figure 1: Microscopic view of a venule with surrounding connective tissue. Stained pink and purple, typical of histological preparations.
Light micrograph image of adipose tissue stained with H&E, highlighting an arteriole and adjacent venule. The arteriole appears as a small, circular structure with multiple layers stained intensely eosinophilic. The venule, situated nearby, exhibits a larger lumen and less defined wall. The background consists of adipocytes with clear cytoplasm and peripherally located nuclei; all are arranged in a non-uniform pattern against a white background.
Figure 2: Microscopic view of an arteriole and venule in adipose tissue, stained pink. Shows circular vessels surrounded by fat cells.
High-magnification microscopic image. Polygonal, white adipocytes are stained with green Masson's trichrome, with a red portion to the right. A central, irregularly shaped space, likely a blood vessel lumen, is light brown. Connective and muscle tissues are stained green and red, respectively.
Figure 3: Masson’s trichrome stain shows a small vein wall with adjacent tissue and blood vessel.

Figure 1: Lymph node [in mesentery see dark structures], H&E, 40X Slide 30
Figure 2: Mesentery, Masson stain, 40X Slide 095M
Figure 3: Slide 092F Muscular or medium sized artery and companion vein, Masson stain, 20X.
All by University of Michigan Histology, licensed under CC BY-NC-SA 3.0.

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Arterioles
Sinusoidal Capillaries
Fenestrated Capillaries
Continuous Capillaries
Venules
Veins

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