Page 455 - Atlas of Histology with Functional Correlations

aggregations of lymphatic tissue containing small lymphocytes, associated cells,

and various blood cells. Venous sinuses (2, 9) are dilated vessels lined with the
modified endothelium of elongated cells that appear cuboidal in transverse
sections.

Also present in the red pulp are the pulp arteries (10), branches of the
central artery (4) after it leaves the lymphatic nodule (3). Capillaries and pulp

veins (venules) are also present.

Connective tissue trabeculae with a trabecular artery (6) and trabecular
vein (7) are evident.

FIGURE 11.14 ■ Spleen: red and white pulp. Stain: hematoxylin and eosin.
Medium magnification.

FIGURE 11.15 | Red and White Pulp of Spleen

A low-magnification photomicrograph illustrates a section of the spleen. A dense
irregular connective tissue capsule (1) covers the organ. From the capsule (1),
connective tissue trabeculae (3) with blood vessels extend into the interior of

the organ. White pulp (2) consists of lymphocytes and lymphatic nodules (2a)
with a germinal center (2b), and a central artery (2c) is located off-center.
Surrounding the white pulp lymphatic nodules (2) is the red pulp (4), primarily
composed of venous sinuses (4a) and splenic cords (4b).

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