Page 448 - Atlas of Histology with Functional Correlations

FIGURE 11.8 | Lymph Node: High Endothelial

Venule in Paracortex (Deep Cortex) of Lymph

Node

The paracortex of lymph nodes contains postcapillary venules with an unusual
morphology to facilitate the migration of lymphocytes from the blood into the
lymph node. This image shows a high endothelial venule (2) lined by tall
cuboidal endothelium, instead of the usual squamous endothelium. Several
migrating lymphocytes (3) are seen moving through the venule wall between

the high endothelium (2) into the paracortex. Surrounding the high endothelial
venule (2) are lymphocytes of the paracortex (5), a medullary sinus (1), and a
venule (4) with blood cells.

FIGURE 11.8 ■ Lymph node: high endothelial venule in the paracortex (deep
cortex) of a lymph node. Stain: hematoxylin and eosin. High magnification.

FIGURE 11.9 | Lymph Node: Subcapsular Sinus,

Trabecular Sinus, and Supporting Reticular

Fibers

A section of a lymph node, stained with the silver method, illustrates the intricate
arrangement of the supporting reticular fibers (6, 9) of a lymph node. The
thicker and denser collagen fibers in the connective tissue capsule (3) stain pink.
Both the capsule and the lymph node are supported by delicate reticular fibers (6,

9) that stain black and form a fine meshwork throughout the organ.

The zones illustrated in Figure 11.5 and stained with hematoxylin and eosin

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