Red pulp of the spleen.
Part of the wall and lumen of a
red pulp sinusoid
is shown here along with some adjacent
red pulp cord
cord of Billroth
) on the left.
The plane of section through the sinusoid appears to be transverse to its long axis as indicated by the varying shapes and sizes of the
that make up this part of its wall. These cells have a fusiform three-dimensional shape, and their
long axis parallels that of the vessel. A few endothelial cells are cut through the nucleus, but many more show only small proF
cytoplasm. The basement membrane of the endothelium is incomplete, and only a couple of pieces are visible here. In life, the formed
elements of blood squeeze between endothelial cells to move into and out of the red pulp cords.
, and all
are suspended in the reticular framework of the red pulp cord tissue.