FORMATION OF LYMPHOCYTES:
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The precursor of lymphocytes are the stem cells (haematoblasts) present in the liver of foetus and in the bone marrow of adult.
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Immature lymphocytes are produced from there stem cells by the process of haematopoiesis or lymphopoiesis.
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Some of these get matured in the bone marrow itself and some of them mature in the thymus.
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Maturation of B-cells takes place in the bone marrow and final differentiation takes place in the lymphoid tissue of spleen, tonsils, Peyer’s patches of small intestine, appendix, etc.
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T-cells are formed from the stem cells in bone marrow and maturation takes place in the thymus.
