Page 354 - Veterinary Immunology, 10th Edition

VetBooks.ir

FIG. 12.18 Comparison between the major route of circulation of T
cells in the pig and that in other mammals. Note that pig
lymphocytes are largely confined to the bloodstream.

In marine mammals, lymph node structure is highly variable.
Thus all the lymph nodes of bottlenose dolphins (Tursiops truncatus)

are of conventional structure. In striped dolphins, (Stenella
coeruleoalba), on the other hand, some lymph nodes (mesenteric, for
example) are of conventional structure, whereas others

(mediastinal) have the inverted structure described previously.
Thus both forms of lymph node may be present in a single
individual.

Hemolymph Nodes

Hemolymph nodes are structures similar to lymph nodes found in
association with some blood vessels of ruminants and other
mammals. Their function is unclear. They differ from conventional

lymph nodes in that their lymphatic sinuses contain numerous red

354