CHAPTER 8
Blood and Hemopoiesis
153
Hematopoietic
Hematopoietic
compartment
compartment
Hematopoietic
Hematopoietic
compartment
compartment
Sinusoidal
Sinusoidal
capillary
capillary
Hematopoietic
compartment
Hematopoietic
compartment
Sinusoidal
capillary
Leukocyte granules
Mature neutrophili
or neutrophilic
metamyelocyte
Leukocyte precursors
Endothelial cell
Sinusoidal
Sinusoidal
capillary
capillary
Sinusoidal
capillary
Figure 8-16.
Developing blood cells in the bone marrow.
EM,
3
5,000
The two compartments of the red (hematopoietically active)
bone marrow
can be distinguished here. The
vascular compartment
is
composed of
sinusoidal capillaries
, which in this view contain numerous mature erythrocytes. The
hematopoietic compartment
is
composed of blood cells and the precursors and progenitors of blood cells suspended in a loose network of support cells and reticu-
lar F
bers. The cells seen in the hematopoietic compartment here appear to be mostly developing or mature granulocytes. The exact
stage of differentiation of individual cells is not as clear here as it is in a bone marrow smear.
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