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It is believed that all blood cells arise from a single type of stem cell in the bone marrow. Because this cell can produce all blood cell types, it is called a pluripotential stem cell.
These cells proliferate and form one cell lineage that will become lymphocytes (lymphoid cell) and another lineage that will form the myeloid cells that develop in bone marrow (granulocytes, monocytes, erythrocytes and megakaryocytes).
These unipotential or bipotential progenitor cells generate precursor cell (blasts).
“Illustration of the morphologically recognizable stages of erythrocytic and granular leukocytic differentiation in myeloid tissue”
Connective tissue
Connective tissue consists of cells and an extracellular matrix that includes extracellular fibers, ground substance and tissue fluid.
Classification of connective tissue
Classification is based on the composition and organization of the cellular and extracellular components and on special functions.
The term “connective tissue” includes a variety of tissues with differing functional properties but with certain common characteristics that allow them to be grouped together.
Thus, connective tissue consist of
1. Connective tissue proper
2. Specialized connective tissue
The tissues that belong to last category are divided into next general types:
-adipose tissue
-blood
-bone
-cartilage
-lymphatic tissue
-hemopoietic tissue
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