The spleen is encased in a thick connective-tissue capsule. Inside, the mass
of splenic tissue is of two types, the red pulp and the white pulp, which
do not separate into regions but intermingle and are distributed
throughout the spleen. The white pulp is lymphoid tissue that usually
surrounds splenic blood vessels. The red pulp is a network of channels
(sinuses) filled with blood, and it is in the red pulp that most of the
filtration occurs.
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