الفهرس 
Introduction and aim of workOnly 14 pages are availabe for public view
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Abstract
INTRODUCTION AND AIM OF WORK
\·arious blood disorders can affect the pediatric age
group. These blood disorders are classified according to each
of blood components and the reticulonodular system.
The first group is diseases pr-imarily invo]·.,.·ing red
blood cells. In infant, red marrow ex1:end throughout the
medullary :a·,.·ities of t1-.e whole ske:eton. In the first few
months red cells are produced also by liver and spleen. As
the physio:ogical requirements for erythrocyte production
diminishes progressivel:v· during the years of growth, a
cessation of this function occurs in the liver and spleen and
red :narrow area .h
L~~e percphers.l
s~”-eletorr. ~:~-- the age or .20 years red marrow is normally
confined to the ~roxima~ ends of femora and humeri and to the
axial skele:on r6sidual areas of fatty non hematopoietic as
well as the liver and spleen ~ay be reactivated as the ~eed
c.:-ise.
The second group is disorders primarily involving white
blood cells. This group include leukemia and lyl!lphomas.
Leukemia affect children almost invariably by acute form. It
is a generalized neoplastic disorders of blood forming
tissues primarily those of leukocytic ser1es.