Spleen is
largest lymphoid organ, oval in outline and protected by thick firm
fibroblastic capsule or Stroma containing a thin layer of smooth muscles in its
inner portion.
External to
capsule is serous coat which is derived from peritoneum; it is thin smooth and
adherent to fibroblastic coat. Blood vessels enter and leave the spleen at a
point called hilus, represented by capsular tissue projected inside. From the
inner surface of the fibroblastic coat numerous small fibrous bands arise and
are distributed in all the directions, they are called as trabeculae. Uniting
of these trabeculae forms the frame work of the spleen. Therefore the spleen
consists of a number of small spaces or areolae. Areolae are also called as
spleen lobules. These areolae contain the spleenic pulp.
Fibroblastic
coat and trabeculae are composed of white and yellow fibrous tissue. Large
amount of WBC’S are found in blood of spleenic pulp. Spleenic pulp shows the
presence of spleenic cells which show amoeboid movement. These cells often contain
pigments and RBC in their interior. Nucleated red-blood corpuscles have also
been found in the spleen of young animals.
Spleenic
pulp contains a unique structure called germinal center which is surrounded by
a typical white pulp, which is slightly differs from spleenic pulp.
SECTIONAL VIEW
SLIDE VIEW
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