CHAPTER 10
Lymphoid System
197
Figure 10-16.
Red pulp of the spleen.
TEM,
3
7,100.
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
many proF
les of
endothelial cells
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
les of
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.
Macrophages
,
plasma cells
, and all
types of
blood cells
and
platelets
are suspended in the reticular framework of the red pulp cord tissue.
Plasma cell
Plasma cell
Sinusoid
Sinusoid
lumen
lumen
Plasma cell
Sinusoid
lumen
Endothelial cells
Basement
membrane
Erythrocyte
Platelet
Macrophage
Macrophage
Macrophage
Lymphocyte
Lymphocyte
Lymphocyte
previous page 212 Dongmei Cui -  Atlas of Histology with Functional and Clinical Correlations 2011 read online next page 214 Dongmei Cui -  Atlas of Histology with Functional and Clinical Correlations 2011 read online Home Toggle text on/off