... u cú h t ủ c sinh t y xng, t m t nguyờn bo mỏu tr ng thnh qua cỏc giai ủo n: nguyờn bo mỏu (myeloblast), ti n t y bo (promyeloblast), t y bo (myelocyte), ủ n h u t y bo (metamyelocyte) ủ n b ch ... qua m y giai ủo n, tr c h t cỏc t bo l i (reticular cells) s n sinh nguyờn bo mụ mỏu, t bo ny s n sinh nguyờn bo mỏu ( Hemocytoblast), nguyờn h ng c u a ki m (basophilic erythroblast) v nguyờn ... ch y u lm ch c nng sinh s n cỏc t bo thu c dũng lympho (lymphocyte), m t s t y bo v h ng c u non Giai ủo n t o mỏu t y xng Khi m h xng hỡnh thnh, t y xng ủ m nh n s n sinh b ch c u, d n d n t y...