Publication: Scanning electron microscopy of swine lymphoid organs
Authors
Ramos, José ; Ramis, Antonio J. ; Rabanal, Rosa M. ; Marco, Alberto ; Domingo, Mariano ; Ferrer, Luis M.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
The aim of this investigation was to study by
scanning electron microscopy the structure of several
swine lymphoid organs (lymph nodes, Peyer's patches,
and tonsil). Two groups of animals were used: sixmonth-
old pigs and six- to nine-day-old piglets. Samples
were jet-washed to eliminate most free cells in order to
observe the reticular framework of these organs more
clearly. Peyer's patches in piglets showed two types of
villi. In one of them the cellular types were absorptive
cells and goblet cells. The second type of villi were
shorter and wider, with M cells characterized by
presenting long, thick microvilli over their surfaces.
Peyer's patches of pigs did not show this second type of
villi but were usually covered by absorptive villi. The soft
palate tonsil was similar in both groups of animals with its
surface epithelia1 cells full of microfolds, partially and
frequently obscured by microorganisms. The appearance
of the surface epithelium in the same crypt was different
depending on the area. There was a large number of
holes through which cells apparently passed towards the
crypt lumen. The medulla in the lymph nodes was at the
periphery and showed a dense reticular framework.
Cortex-like lymphoid tissue was formed by lymphoid
follides and diffuse lymphoid tissue with high endothelid
venules and lymphatic sinuses. The serosal surface of lymphoid organs was formed either by a typical
mesothelial cell layer (small intestine) or by loosely
arranged connective fibers (lymph nodes).
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